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The 8 Best hardwired smoke detector of 2024

Are you trying to find hardwired smoke detector among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling hardwired smoke detector on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 23 hours of research and did 54 hardwired smoke detector tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best hardwired smoke detector you can buy today

SaleNo. 1
First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack
  • Note: A loose neutral (white wire) connection within the home junction box could prompt a device malfunction
  • Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarm
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • Can connect to other compatible BRK or First Alert smoke detectors, to ensure all alarms will sound when smoke is detected
  • Simple to use, with a single test/silence button, and side load battery compartment; Tamper resistant locking brackets and universal mounting brackets make installation easy
  • Rigorously tested to meet UL standards. Emits T3 pattern
  • Keep your family safe with this 6 pack of hardwired smoke alarms; the battery backup means constant monitoring, even if there's a power failure
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety. easy-to-access battery drawer that allows you to replace the battery without dismounting the alarm
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
SaleNo. 2
Kidde Smoke Detector, Hardwired Smoke Alarm with Battery Backup, Front-Load Battery Door, Test-Silence Button, White
6,901 Consomer Reviews
Kidde Smoke Detector, Hardwired Smoke Alarm with Battery Backup, Front-Load Battery Door, Test-Silence Button, White
  • Ionization sensing technology - hardwired smoke detector senses invisible fire particles, 85 decibel alarm alerts of fire
  • Still works during power failures - smoke alarm with battery backup operates on a 120V power source with 9V battery included
  • Easy to install & front-load battery door makes for quick battery replacements
  • Test-Hush Button - it’s simple to test or hush false alarms by pressing the button right on the face of the device
  • UL Certified, 10-year limited warranty
  • Interconnectable with up to 24 devices (of which 18 can be initiating) including smoke, CO and heat alarms. See user’s guide for complete instructions
No. 3
First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
  • Keep your family safe with this hardwired smoke alarm the battery backup means constant monitoring, even if there's a power failure
  • Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarm
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • Can connect to other compatible BRK or first alert smoke detectors, to ensure all alarms will sound when smoke is detected
  • Simple to use, with a single test/silence button, and side load battery compartment tamper resistant locking brackets and universal mounting brackets make installation easy
  • Rigorously tested to meet UL standards120 volt AC power with 9V battery backup to keep alarm functioning during power outage
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
No. 4
Kidde Smoke Detector, Hardwired Smoke Alarm with 9-Volt Battery Backup, Test-Reset Button, Interconnect Capability, White, 6 Pack
  • Ionization sensor technology senses invisible fire particles, while a electrochemical sensor detects CO gas
  • Smoke alarm operates on a 120V wired power source with a 9-Volt alkaline battery backup
  • An 85-decibel alarm sounds & a red LED indicates the smoke detector is sensing smoke or fire
  • Test-Hush button makes it easy to test the smoke detector and silence false alarms that occur from cooking or shower steam
  • Interconnection capability: allows you to connect up to 18 Kidde smoke, heat, or CO alarms, with the possibly it interconnect 6 strobe lights or relay modules
  • UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.
SaleNo. 5
FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White
  • Keep your family safe with this hardwired smoke and carbon monoxide alarm; The battery backup means constant monitoring, even if there's a power failure
  • Features an electrochemical carbon monoxide sensing technology as well as an ionization sensor for smoke detection.
  • Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85 decibel siren provides a clear, loud warning upon detection
  • Can connect to other compatible BRK or First Alert detectors, to ensure all alarms will sound when threat is detected
  • Simple to use, with a single test/silence button, and side load battery compartment; Tamper resistant locking brackets and universal mounting brackets make installation easy
  • Rigorously tested to meet UL standards
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
No. 6
First Alert BRK 7010B Hardwired Smoke Detector with Photoelectric Sensor and Battery Backup , White
  • 120 volt hardwire smoke alarm with photoelectric sensor and battery backup
  • Features convenient 9 volt battery backup, silence/test button, dust cover, 85 decibel alarm
  • Inter connectable with BRK and first alert hardwired smoke and carbon monoxide alarms
  • Intuitive latching alarm indicator identifies which unit triggered alarm. Backed by 10 year limited warranty and tested to meet UL 217 standards
  • 85 decibel alarm
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
No. 7
SITERWELL Smoke Detector, Hardwired Photoelectric Smoke Alarm with DC 9V Backup Battery & Interconnected, Fire Alarm with Silence Button, GS517, 6 Packs
  • HARDWIRED SMOKE DETECTOR - Hardwired interconnected smoke alarm, can connect up to 12 alarms. It is more precise and stable than wireless interconnection.
  • INTERCONNECTION TEST - If the fire detectors are interconnected, you only need to press one test button during the weekly test, and the rest can be tested at the same time.
  • 9V BATTERY BACKUP - The fire alarm is powered by a 120V power and a 9V backup battery. The alarm battary will last for at least 1 year, providing protection in the event of a power outage.
  • SILENCE MODE - Worried about false positives? The smoke detector has a silence button, you can hold it down for five seconds to calm it.
  • SIZE & CAPABILITY - 5” diameter x 1.6” depth, UL217 certified. Home fires start every 83 seconds, the fire detector can quickly identify the fire and allow the family to flee quickly.
SaleNo. 8
Kidde i4618AC Battery Powered Hardwire Smoke Alarm, 4 Pack
  • Easy Installation - Front battery pull tab allows battery activation without removing alarm from mounting bracket. Large mounting base makes mounting easier, protects surface paint from dirt and covers imperfections. Pre-stripped wiring harness with easy off cap does not require stripper tool. Tinned strands increase conductivity and wire nut grip.
  • Fewer Callbacks - Large centrally located Test/Hush alarm control button. Dust cover protects sensor from contaminates during construction reducing nuisance alarms.
  • User-Friendly Features - Easy access front loading battery door. Battery backup provides protection in case of power failure. Interconnectable with up to 24 devices (of which 18 can be initiating) including smoke, CO and heat alarms. See user’s guide for complete instructions.
  • Alarm memory flashes red LED indicating which unit was the initiating alarm in interconnected system. Temperature Range: 40 degree Fahrenheit to 100 degree Fahrenheit
  • Tamper resist locking feature deters alarm theft
No. 9
X-Sense Smoke Detector Carbon Monoxide Detector Combo Hardwired with Voice Location, Hardwired Interconnected Smoke and Carbon Monoxide Detector, Model XP02-AR, 1-Pack
1,033 Consomer Reviews
X-Sense Smoke Detector Carbon Monoxide Detector Combo Hardwired with Voice Location, Hardwired Interconnected Smoke and Carbon Monoxide Detector, Model XP02-AR, 1-Pack
  • Hardwired Alarm with CR123A Battery Backup: Equipped with photoelectric and electrochemical sensors that detect both smoke and carbon monoxide, providing enhanced protection against dual threats for your family
  • Voice Alarm with Location: When there's danger, the alarm announces, "Warning! Smoke detected in Living Room. Evacuate." or "Warning! Carbon monoxide detected in Basement. Move to fresh air." Clearly tells the type and location of the danger, allowing for quick action
  • Voice Reminder Function: This smoke and carbon monoxide alarm provides voice alerts for threats, missed alarms, low battery, or malfunctions, ensuring that you never miss important notifications
  • 10-Year Product Life: Made from a heat and corrosion-resistant PC material, with a sensor life of 10 years, this hardwired combination alarm offers a decade-long lifespan
  • Hear the Alarm No Matter Where You Are: Interconnects with all X-Sense hardwired alarms, including models XP04, XP06, and other XP02-AR devices, creating an interconnected home safety network; if one alarm sounds, they all activate
SaleNo. 10
First Alert BRK 9120Bff-6 Hardwired Smoke Detector with Battery Backup, 6-Pack
  • 6 pack of hardwired smoke alarms, includes battery backup for power outages
  • Tamper resistant locking pins, single button silence/test and loud 85Db alarm
  • 120-Volt AC power with 9-volt battery backup (included) to keep alarm functioning during power outage
  • Open mounting design for easy installation with side load battery compartment for quick replacement and interconnect able up to 18 units (12 smoke, 6 co/heat/relay)
  • 10-Year limited
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
SaleNo. 11
Kidde Hardwired Smoke & Carbon Monoxide Detector, AA Battery Backup, Interconnectable, LED Warning Light Indicators
  • 24/7 Self-testing components are always checking the device to ensure it's operating as expected (not a substitute for a manual push test)
  • Easy installation mounting bracket included for quick installation in 4 orientations
  • Photoelectric sensor detects visible fire particles associated with slow, smoldering fires, while the electrochemical sensor detects carbon monoxide
  • 85-decibel alarm & LED warning indicators alert you to various status: green = normal operation, amber = operating error, and red = smoke, fire or carbon monoxide event
  • Battery operated to provide reliable detection, even during power outages; two AA batteries included
  • UL Listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.
No. 12
Smoke Detector, Hardwired Interconnected Smoke Detectors, Smoke Alarm with Replaceable 9V Battery, Interconnects Up to 12 Fire Alarms Smoke Detectors, Photoelectric Fire Alarm with Test/Silence Button
  • [Hardwired interconnection] Up to 12 smoke alarms can be interconnected to cover your entire home. When one detects smoke, they all make a sound to alert everyone in the house, creating an interconnected safety net for your home.
  • [9V Battery backup] Hardwired smoke detectors are equipped with 9V lithium batteries. Ensure that all units are always connected and continue to function properly, even in the event of a power failure. Low battery alarm reminds you to replace the battery as soon as possible. If an error occurs, the system automatically triggers the fault mode, prompting you to check the device.
  • [Test Mute button and LED light] It is connected with other alarms. Just press the test/mute button on one of the units to test or mute the entire interconnected system. If the smoke alarm is in normal working condition, the green LED light is always on and the red LED light flashes every 32 seconds
  • [Photoelectric smoke sensor] Based on advanced photoelectric technology, smoke alarms can be more sensitive, fast, accurate measurement of smoke levels. More than 85 decibels of alarm sound, you can more clearly hear the danger coming.
  • [Simple installation] The installation of smoke alarm is very simple. The AC connector is connected only to the mains power and signal cables. (Please connect as instructed)
SaleNo. 13
Kidde Hardwired Smoke Detector with 9-Volt Battery Backup, Photoelectric Smoke Alarm, Battery Included
2,052 Consomer Reviews
Kidde Hardwired Smoke Detector with 9-Volt Battery Backup, Photoelectric Smoke Alarm, Battery Included
  • Photoelectric sensor technology senses visible fire particles, associated with smoldering fires
  • Smoke alarm operates on a 120V wired power source with a 9-Volt alkaline battery backup (included)
  • An 85-decibel alarm sounds & a red LED indicates the smoke detector is sensing smoke or fire
  • Test-Hush button makes it easy to test the smoke detector and silence false alarms that occur from cooking or shower steam
  • UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.
SaleNo. 14
Kidde 21026063 AC Hardwired Smoke Detector Alarm with 9V Back up and Front Load Battery Door
  • Easy Installation - Front battery pull tab allows battery activation without removing alarm from mounting bracket. Large mounting base makes mounting easier, protects surface paint from dirt and covers imperfections. Pre-stripped wiring harness with easy off cap does not require stripper tool. Tinned strands increase conductivity and wire nut grip.
  • Fewer callbacks - Large centrally located Test/Hush alarm control button. Dust cover protects sensor from contaminates during construction reducing nuisance alarms.
  • User-friendly features - Easy access front loading battery door. Battery backup provides protection in case of power failure. Interconnectable with up to 24 devices (of which 18 can be initiating) including smoke, CO and heat alarms. See user’s guide for complete instructions.
  • Alarm memory flashes red LED indicating which unit was the initiating alarm in interconnected system. Temperature range: 40 degree Fahrenheit to 100 degree Fahrenheit
  • Tamper resist locking feature deters alarm theft. Audio Alarm-85dB at 10feet
No. 15
SITERLINK Smoke Detector Hardwired, Smoke Alarm Interconnected with Battery Backup, Photoelectric Fire Alarms Smoke Detectors with LED Lights, UL217 Listed Fire Alarm for House, GS517, 2 Packs
  • Operated by AC 120V with 9V Battery Backup: SITERLINK hardwired smoke detector will last 10 years; the device includes 9V lithium battery, can be used normally even if the power outages; detected and notified automatically if it is low battary or error occured
  • Photoelectric Sensor for Accurately Detect: Photoelectric sensor smoke alarm helps to monitor smoke and fires quickly, provides the warning of fires as soon as possible; the loudly alarm signal (Loud>85dB) helps your family keep far away from fire dangerous
  • Alarming with Wired Interconnection: SITERLINK smoke detector with hardwired interconnection fuction up to 12 devices can be connected, one of alarms detects smoke, others will alarm with same sound signal but NO red LED flash, reliable security guards of different room of your big house
  • Test-Silence Button and LED Lights: Fire alarm with test button would be tested weekly by pushing the test button; if sounds the alarm signal without fire dangerous, could push the test button 2 seconds to silence it, please clean smoke, dust or insects in it; the green LED light means working, the red LED light is alarming or warning
  • High Quality and Friendly Customer Support: SITERLINK smoke alarm built with first-class fire-retardan PC plastic material, tested strictly before being sold in the market; any issue, please contact us, we will help you find a solution
SaleNo. 16
FIRST ALERT BRK 9120LBL Hardwired Smoke Detector with Adapter Plugs for Easy Replacement , White
1,415 Consomer Reviews
FIRST ALERT BRK 9120LBL Hardwired Smoke Detector with Adapter Plugs for Easy Replacement , White
  • Convenient adapter plugs makes it easy to replace existing hardwired alarms without needing to rewire
  • Keep your family safe with this hardwired First Alert smoke alarm with a 10-year battery backup, which means constant monitoring for the life of the alarm, even if there's a power failure
  • Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast-flaming fires and alerts you with an 85-decibel alarm
  • Can connect to other compatible BRK or First Alert smoke alarms, to ensure all alarms will sound when smoke is detected
  • Simple to use, with a single test/silence button, and side-load battery compartment; tamper-resistant locking brackets and universal mounting brackets make installation easy
  • Emits T3 pattern; Rigorously tested to meet UL standards
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
SaleNo. 17
FIRST ALERT BRK 9120LBL Hardwired Smoke Detector with Battery Backup
  • Keep your family safe with this hardwired smoke alarm; The 10-year battery backup means constant monitoring for the life of the alarm, even if there's a power failure
  • Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast-flaming fires and alerts you with an 85-decibel alarm
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • Can connect to other compatible BRK or First Alert smoke detectors, to ensure all alarms will sound when smoke is detected
  • Simple to use, with a single test/silence button, and side-load battery compartment; Tamper-resistant locking brackets and universal mounting brackets make installation easy. Emits T3 Pattern
  • First Alert warranty extends ten years from the date of purchase with proof of the original sales receipt and the product should be free from defect in material and workmanship
No. 18
X-Sense Hardwired Combination Smoke and Carbon Monoxide Detector, Hardwired Interconnected Smoke and CO Detector Alarm with Replaceable Battery Backup, XP04, 1-Pack
  • More Accurate with Intelligent Technology: This hardwired smoke and carbon monoxide detector combines an advanced photoelectric smoke sensor and a Figaro electrochemical CO sensor to detect smoke from smoldering fires and dangerous CO levels quickly
  • Hardwired Alarm with Replaceable Battery Backup: This combination smoke and carbon monoxide detector is AC hardwired with a 9 V battery backup, so the alarm can continuously monitor for smoke and CO even if there is a power outage
  • Interconnects Up to 18 Units for Full Coverage: You can connect up to 18 X-Sense 2-in-1 hardwired alarm, so when one alarm is triggered, all will sound together throughout your home
  • Easy Installation: All mounting hardware is included for fast and simple installation in minutes
  • Premium Quality: Made from high-quality materials and components, this hardwired combination alarm offers a long lifespan of up to 10 years
SaleNo. 19
First Alert BRK SC7010B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup , White
  • Keep your family safe with this hardwired smoke and carbon monoxide alarm; The battery backup means constant monitoring, even if there's a power failure
  • Features electrochemical Carbon Monoxide sensing technology as well as a photoelectric sensor equipped with Optipath 360 technology that enhances detection with 360 degree access and reliably detects smoke from smoldering fires
  • In case of danger, the loud spread spectrum alarm is designed to be heard easily by even those with some hearing issues
  • Can connect to other compatible BRK or First Alert detectors, to ensure all alarms will sound when threat is detected
  • 10 year limited warranty; Equipped with end of life signal chirp, so you know when it's time to replace the unit for your safety
  • Rigorously tested to meet UL standards
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
SaleNo. 20
FIRST ALERT BRK 3120B-6 Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup, 6-Pack , White
  • The front cover design of the alarm may vary but product function remains the same.
  • Keep your family safe with this 6-pack of hardwired smoke alarms; The battery backup means constant monitoring, even if there's a power failure
  • Equipped with both a photoelectric and ionization sensor to quickly detect both fast burning, and smoldering fires, which alerts you with an 85-decibel alarm
  • Equipped with Optipath 360 technology that enhances detection with 360-degree access, and reliably detects smoke
  • To ensure complete protection make sure to place 1 on each level of your home and in each bedroom
  • Simple to use, with a single test/silence button and side-load battery compartment; Included mounting bracket makes installation easy
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety

How to choose a good hardwired smoke detector

Does the idea of finding a fantastic hardwired smoke detector make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in hardwired smoke detector. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top hardwired smoke detector products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top hardwired smoke detector on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top hardwired smoke detector brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top hardwired smoke detector based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the hardwired smoke detector were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good hardwired smoke detector, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your hardwired smoke detector.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting hardwired smoke detector for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our hardwired smoke detector. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what hardwired smoke detector should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on hardwired smoke detector.