First alert model number 9120b

First Alert is the category leader in fire safety and delivers reliable life safety products that help our consumers protect what matters most through innovation and performance. Working smoke alarms cut the risk of dying in a home fire by 50% and that's important because a home structure fire was reported every 86-seconds. The faster you know about a fire, the faster you can start moving your ...

WPS stands for Wi-Fi Protected Setup. It is a wireless network security standard that allows you to easily connect devices, such as printers, to your home or office network. One of...20 results for "first alert model 9120" Results. First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, 1-Pack. 4.7 out of 5 stars 30,444. $14.36 $ 14. 36. FREE delivery Mon, Oct 16 on $35 of items shipped by Amazon. ... FIRST ALERT CO605 Plug-in Battery Backup Carbon Monoxide Alarm and FIRST ALERT 9120B Smoke …Improved UV Resistance: Keeps alarm from discoloring over time. Standards: UL 217, CSFM, NFPA 72, HUD, FHA. Warranty: 10 Year Limited. Product Dimensions (LxWxH): 5 x 2 x 5 in. Product Weight: .85 lbs. Smoke particles of varying number and size are produced in all fires. For maximum protection, use both ionization and photoelectric sensing ...current price $69.99. First Alert BRK 9120B (5pack) AC Powered Smoke Detector Alarm w/Battery Backup. 2. 3.5 out of 5 Stars. 2 reviews. BRK 9120B Hardwired Smoke Alarm with Battery Backup, Keep your family …What do First Alert smoke or CO alarms sound like? Learn More > Register your product. Request a combination or key. First Alert Consumer Support. Hours of Operation: Mon-Fri (9am - 8pm CT) Sat-Sun (9am - 5:30pm CT) 1-800-323-9005. Onelink & Smart Home Support. Hours of Operation: Mon - Fri (9am - 8pm CT) Sat - Sun (9am - 5:30pm CT) 1 …Product Details. Power Source: Hardwired. Battery Backup: 9V. Sensor: Ionization. Interconnect: Can be linked with up to 18 units (12 Smoke, 6 CO/Heat/Relay) Smart Technology :Helps reduce nuisance alarms. Noise Output: 85 dB in a T3 Pattern. Single Button: One press to silence and test alarm.6 days ago ... fixing “smoke detector” that beeps EVEN with NEW BATTERY [first alert] bel 9120bp. 3 views · 6 minutes ago ...more ...

With the battery backup, the 9120B will protect you and your family even during a power outage. Interconnect the 9120B with up to 12 First Alert or BRK hardwired alarms and up to six other compatible devices like bells, horns or repeaters. When one alarm sounds, all other alarms are triggered, providing coverage of larger spaces. View and Download First Alert SC9120B user manual online. Smoke & Carbon Monoxide Alarm. SC9120B carbon monoxide alarm pdf manual download. Also for: 9120, 9120b. View and Download First Alert 9120 user manual online. AC Powered Ionization Smoke Alarm with Battery Back-up, Silence and Latching Features. 9120 smoke alarm pdf manual download. ... (Model 9120B only). Improved UV Resistance keeps the alarm from discoloring over time. USER'S MANUAL. Smoke Alarms. AC Powered Ionization Smoke. …27 Jun 2022 ... This hardwired combination Smoke and Carbon Monoxide Alarm uses an electrochemical CO sensing technology and Ionization sensor for smoke ...First Alert 9120B User Manual (2 pages) AC Powered Smoke Alarms with Battery Back-up and Silence 120V AC ~, 60 Hz, 0.04A. Brand: First Alert | Category: Smoke Alarm | Size: 1.21 MB.USER'S MANUAL. This Smoke larm is designed to be mounted on any standard wiring junction box to a 4-inch (10 cm) size, on either the ceiling or wall. Read "Recommended …

Mar 1, 2018 · In Stock. This item: $7299. First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack. $1428. FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White. $3342. These items are shipped from and sold by different sellers. Change Smoke Alarm Battery. First Alert 9120B First Alert maintains high manufacturing standards in all of our products. First Alert, Onelink, and BRK have had no product recalls in the past decade. If a First Alert product isn't working as expected, browse our Help Center for solutions or contact our Support Team. To check product recalls for any consumer product (including First Alert ...View the First Alert 3120B manual for free or ask your question to other First Alert 3120B owners. Manua. ls. Manua. ls. First Alert smoke detectors · ... First Alert: Model: 3120B: Product: smoke detector: Language: English: Filetype: User manual (PDF) ... First Alert 9120B manual 7 pages. First Alert 7020BSL manual 2 pages. First Alert SCO5 manual …

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19 Oct 2023 ... First Alert SC9120B combination smoke and carbon monoxide alarm test. · Comments1.Rated 4.90 out of 5 based on 58 customer ratings. $ 12.95. The First Alert 9120B is an affordable hardwired Smoke Alarm alarm providing accurate sensing technology, easy installation, and connectivity. Bulk Quantity discounts are available – send us a message to receive a quote!First Alert 9120, 9120B OPTIONAL LOCKING FEATURES, TO LOCK THE BATTERY COMPARTMENT, TO UNLOCK THE BATTERY COMPARTMENT, TO UNLOCK THE MOUNTING BRACKET, TO LOCK THE MOUNTING BRACKET. 1. 7. Download 7 pages, 2.06 Mb. OPTIONAL LOCKING FEATURES ... (Model 9120B Only) Once the Smoke … SKU: 9120BA. 4.5 / 5.0. (876 Reviews) WHERE TO BUY. 120-volt hardwired smoke alarm wires directly into your home's electrical system. Ionization smoke sensor reliably detects particles from fast-flaming fires. Hassle-free installation, no need to rewire. Easy-to-access battery drawer; 9-volt battery included.

Rated 4.90 out of 5 based on 58 customer ratings. $ 12.95. The First Alert 9120B is an affordable hardwired Smoke Alarm alarm providing accurate sensing technology, easy installation, and connectivity. Bulk Quantity discounts are available – send us a message to receive a quote!19 Apr 2015 ... ... alarm unit and user manual. Installation is really easy but if you are hard wiring to the ceiling I suggest you turn off the power to do ...9 Sept 2020 ... An animated video of the first alert 9120b latching. A latching alarm indicator (or alarm memory in Kidde smoke detectors) is a feature on ...Summary of Contents for First Alert 9120 Page 1 Position the base of the Smoke larm over the mounting bracket and turn. The Fire Department for detailed fire protection requirements in buildings not defined as larm Models 9120, 9120B, SC6120B, SC9120B, 7010, 7010B, SC7010B, SC7010BV, lways discharge the branch circuit before servicing an C or C ... SKU: 1039935. The First Alert SCO2 Battery-Operated Combination Smoke and Carbon Monoxide Alarm is easy to install and operate. Equipped with an ionization smoke sensor and an electrochemical CO sensor, it provides 2-in-1 protection from smoke produced by flaming fires and carbon monoxide leaks from multiple sources. In Stock. This item: $7299. First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack. $1428. FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White. $3342. These items are shipped from and sold by different sellers. Shop First Alert BRK 6-Pack Hardwired Combination Smoke and Carbon Monoxide Detector in the Combination Smoke & Carbon Monoxide Detectors department at Lowe's.com. The BRK SC9120 hardwired combination smoke and carbon monoxide alarm uses electrochemical Co sensing technology and ionization sensor for smoke detection. This SKU: SC7010BV. 4.6 / 5.0. (3939 Reviews) WHERE TO BUY. The First Alert SC7010BV Hardwired Talking Photoelectric Smoke and Carbon Monoxide Alarm detects both carbon monoxide and smoke all in a single device. The 120-volt CO smoke alarm features a photoelectric smoke sensor and electrochemical carbon monoxide sensor for complete …To speak with a First Alert representative, click the "Need Help" button and submit your question. If we can't find an answer for you right away, you have the option to connect with a live agent via phone. Contact our Support Team. FIRST ALERT SUPPORT. 1-800-323-9005. Mon - Fri (7am - 7pm CST) Sat - Sun (8am - 6pm CST) ONELINK …Model: SC9120B. Download product manual. Register your product. ... First Alert Consumer Support. Hours of Operation: Mon-Fri (9am - 8pm CT) Sat-Sun (9am - 5:30pm CT)

WPS stands for Wi-Fi Protected Setup. It is a wireless network security standard that allows you to easily connect devices, such as printers, to your home or office network. One of...

First Alert Smoke and CO Alarm Disposal / Recycling. Learn how to properly dispose of old detectors. Install a Hardwired First Alert Alarm. Learn the step-by-step process for installing a hardwired alarm. Find more information about your First Alert or BRK product, including manuals, tutorials, and more. ‎FIRST ALERT : Style ‎Hardwired Alarm : Power Source ‎Battery Powered,Hardwired : Color ‎White : Product Dimensions ‎1.9"D x 5.6"W x 5.6"H : Item Weight ‎8 ounces : Alarm ‎Audible : Sensor Type ‎electrochemical,ionization : Manufacturer ‎First Alert : Part Number ‎SC9120B : Country of Origin ‎Mexico : Item model number ...You can mix and match hardwired First Alert, BRK, and Onelink models. All of our current models use the same wiring harness and connector. ... Number of Views 38.82K. First Alert Compatibility: Ways to Interconnect Smoke and/or CO Alarms. Number of Views 34.61K. Lost Safe Keys or Combinations for First Alert Branded Safes. Number of …Review and installation of First Alert 9120B6CP 120-Volt Wire-In With Battery Backup Smoke Alarm, 6-Pack available on Amazon.com https://amzn.com/B000KKHWLUThe First Alert BRK SC-9120B Hardwired Combination Smoke and Carbon Monoxide Alarm uses electrochemical CO sensing technology and Ionization sensor for smoke detection. This hardwired dual CO smoke alarm can be connected to other compatible BRK or First Alert hardwired CO smoke detectors within a single-family …Does First Alert recycle old detectors? First Alert has a complimentary disposal program for up to 4 intact ionization smoke detectors (postage not included). These must be First Alert, BRK, Family Gard, or Onelink brand. If you have more than 5 detectors, we can help you dispose of them for a small fee. ... Number of Views 52.92K. First Alert …Low Battery: This is the most common reason for chirping smoke alarms. It's usually a single beep at intervals of 30 to 60 seconds. Replacing the batteries with fresh ones should silence the alarm. End of Life: Smoke alarms don't last forever. If your smoke detector is chirping constantly or in a different pattern than usual, it may be nearing ...

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Shop First Alert BRK 6-Pack Hardwired Combination Smoke and Carbon Monoxide Detector in the Combination Smoke & Carbon Monoxide Detectors department at Lowe's.com. The BRK SC9120 hardwired combination smoke and carbon monoxide alarm uses electrochemical Co sensing technology and ionization sensor for smoke detection. This The 9120B AC-powered smoke alarm with battery backup includes these features: Ionization sensor which helps detect fast flaming fires that consume combustible materials rapidly. 120-volt AC inter-connectable (with maximum 18 compatible devices). The alarm can be interconnected with up to 12 other compatible smoke alarms and six compatible ...First Alert has a complimentary disposal program for up to 4 intact ionization smoke detectors (postage not included). These must be First Alert, BRK, Family Gard, or Onelink brand. If you have more than 5 detectors, we can help you dispose of them for a small fee. For detailed information on our disposal program, please fill out our Customer ...With the battery backup, the 9120B will protect you and your family even during a power outage. Interconnect the 9120B with up to 12 First Alert or BRK hardwired alarms and up to six other compatible devices like bells, horns or repeaters. When one alarm sounds, all other alarms are triggered, providing coverage of larger spaces.WPS stands for Wi-Fi Protected Setup. It is a wireless network security standard that allows you to easily connect devices, such as printers, to your home or office network. One of...‎FIRST ALERT : Style ‎9120B : Power Source ‎Battery Powered : Color ‎White : Product Dimensions ‎1.9"D x 5.6"W x 5.6"H : Alarm ‎Audible : Sensor Type ‎Ionization : Material ‎Plastic : Manufacturer ‎First Alert : Part Number ‎9120B6CP : Item Weight ‎3.47 pounds : Item model number ‎BRK9120b : Batteries ‎1 9V batteries ...The First Alert SA9120BPCN Smoke Alarm with Adapter Plugs helps protect your home and yourself in case of smoke or fire, even during a power outage. This hardwired smoke detector acts as an alarm wired directly into your home's electrical system. The side load battery backup drawer ensures that alarms work even during power outages without ...First Alert is a leading brand of fire safety products, including smoke alarms, carbon monoxide detectors, and combination alarms. Learn how to protect your home and family from fire and carbon monoxide hazards, and explore different models, features, and installation guides for each product category. First Alert also offers wireless and plug-in … ….

Buy from Walmart: https://mavely.app.link/e/uR0hYTJJ3Db*Use the above affiliate link to check out the latest deals on tech products. If you make a purchase, ...First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup. 4.7 out of 5 stars. 3,018. 3K+ bought in past month. $35.10 $ 35. 10. FREE delivery Jan 25 - 26 . ... Model XP02-AR, 1-Pack. 4.5 out of 5 stars. 975. 400+ bought in past month. $42.99 $ 42. 99. Join Prime to buy this item at $29.99. FREE delivery Sat, …First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack. $66.94 $ 66. 94. ... Item model number ‎SC9120B : Batteries ‎1 9V batteries required.View the manual for the First Alert 9120B here, for free. This manual comes under the category smoke detectors and has been rated by 1 people with an average of a 7.5. This manual is available in the following languages: English.Consultez gratuitement le manuel de 9120B de First Alert ou posez votre question à d'autres propriétaires de 9120B de First Alert. ModesdEmploi. fr. ModesdEmploi. fr. ... Model 9120B Input: 120V AC ~, 60 Hz, 0.04A. ... equirements, including UL217 and are designed to detect particles of. combustion. Smoke particles of varying number and size …Easy to Install. Just installed the 9120B Smoke Alarm after painting the hallway celling. This model was the replacement for the smoke alarm that was installed in the celling since 1992, it was really time to update it and it was very easy to do. The alarm looks great and it appears to be doing what it suppose to do, monitoring for a fire.Jan 1, 2008 · First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack. $66.94 $ 66. 94. ... Item model number ‎SC9120B : Batteries ‎1 9V batteries required. First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack. Visit the BRK Store. 4.7 17,406 ratings. 4K+ bought in past month. $1411. … First alert model number 9120b, The model number is typically located on the back of the alarm and in the user manual. Note: We do not have brackets for expired or discontinued alarms. Related Articles. Lock or Unlock an Alarm’s Mounting Bracket. ... First Alert Consumer Support. Hours of Operation: Mon-Fri (9am - 8pm CT) Sat-Sun (9am - 5:30pm CT) 1-800-323-9005. Onelink & Smart …, 1-48 of 78 results for "brk first alert model 9120b" Results. First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack. 4.7 out of 5 stars. 15,039. 5K+ bought in past month. $58.78 $ 58. 78. FREE delivery Jan 18 - 23 . Or fastest delivery Jan 16 - 19 . First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, …, Missiles and missile-defense is one of the main reasons Action Alerts Plus is choosing Raytheon over other defense contractors...RTN There are a lot of reasons to like the defense ..., Enhance your household's fire safety and enjoy greater peace of mind with the First Alert 9120B Hardwired Smoke Alarm with Battery Backup. Equipped with an ionization sensor, this 120-volt hardwired smoke alarm reliably detects smoke from fast-flaming fires and alerts you with an 85-decibel alarm. Included adapter plugs eliminate the need for re-wiring …, 19 Apr 2015 ... ... alarm unit and user manual. Installation is really easy but if you are hard wiring to the ceiling I suggest you turn off the power to do ..., First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack. $66.94 $ 66. 94. ... Item model number ‎SC9120B : Batteries ‎1 9V batteries required., First Alert Consumer Support. Hours of Operation: Mon-Fri (9am - 8pm CT) Sat-Sun (9am - 5:30pm CT) 1-800-323-9005. Onelink & Smart Home Support. Hours of Operation:, First Alert 9120B Manuel D’Utilisation. Télécharger. Aimer. Full screen Plein écran. Page de 7 Aller. INTRODUCTION. ... Smoke particles of varying number and size are produced in all fires. ... Model 9120B. Input: 120V AC ~, 60 Hz, 0.04A. IMPORTANT! PLEASE READ CAREFULLY AND SAVE This user’s manual contains important information about your …, Buy First Alert 9120B Direct. Check the First Alert - Smoke Alarm with Battery Backup - Hardwired ratings before checking out. ... Model: 9120B (0) Write A Review. Ask a Question. $12.00. In-Stock. Ships Tuesday, May 14th. Shipping to 60601 Update Shipping Details First Alert - Smoke Alarm with Battery Backup - Hardwired. Model: 9120B (0) …, 6 days ago ... fixing “smoke detector” that beeps EVEN with NEW BATTERY [first alert] bel 9120bp. 3 views · 6 minutes ago ...more ..., In Stock. This item: $7299. First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack. $1428. FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White. $3342. These items are shipped from and sold by different sellers., Part Number ‎First Alert - 1039809 : Item Weight ‎0.01 ounces : Product Dimensions ‎5.25 x 5.25 x 1.25 inches : Item model number ‎SA9120BPCN : Size ‎1 Count (Pack of 1) Pattern ‎Filter : Voltage ‎120 Volts : Item Package Quantity ‎1 : Number Of Pieces ‎1 : ... First Alert 9120B Smoke Alarm. Gana Hero . Videos for this product. 0:25 . Click to …, 120V AC power with 9V battery backup (included) to keep alarm functioning during power outage. Open mounting design for easy installation with side load battery compartment for quick replacement. Interconnectable up to 18 units (12 smoke, 6 CO/heat/relay). Emits T3 Pattern. 10 Year Limited Warranty. Product Dimensions (LxWxH): 5.6 x 1.9 x 5.6 in., If service is required, do not return the product to your retailer. To obtain warranty service, please contact First Alert Support. Please have the model number and date of purchase available when calling. 1-800-323-9005 Mon-Fri (9 am - 8 pm CST) Sat-Sun (9 am - 5:30 pm CST) 10-Year Sealed Battery Smoke/CO Warranty Service and Returns , Part Number: 9120B; UPC: 00029054513014; Availability: Quantity: Add To Cart . Add To Cart. Add To Estimate. Add To Wishlist. Compare Item. Product Overview. Hardwired smoke alarm with replaceable battery backup. AC 120V Interconnectable with Silence and Latching features. Includes Ionization smoke sensing technology and a 9V Carbon Zinc …, In Stock. This item: $7299. First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack. $1428. FIRST ALERT BRK SC9120FF Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 pack , White. $3342. These items are shipped from and sold by different sellers., Model # 9120B Weight 7.8 oz Dimension 5.6" dia x 2.0"H Operating Voltage 120V AC 60Hz w/ 9V battery backup (9120B only) Operating Current .04 amps (standby/alarm) , current price $69.99. First Alert BRK 9120B (5pack) AC Powered Smoke Detector Alarm w/Battery Backup. 2. 3.5 out of 5 Stars. 2 reviews. BRK 9120B Hardwired Smoke Alarm with Battery Backup, Keep your family …, The smoke alarm shall be a BRK Model 9120B and shall provide at a minimum the following features and functions: 1. A dual ionization sensing chamber. ... Up to 18 units of First Alert or BRK Smoke, CO and Heat Alarms. Maximum of 12 smoke alarms. See user’s manual. Smoke Sensor: Dual Ionization ... Number of Layers: 3 (9120B, 9120AB, 9120LB) 4 …, After an alarm is turned on for the first time, it should last approximately 7-10 years in normal operating conditions. This can vary slightly based on the model you own. Check your alarm's manual for the exact warranty period. If your alarm is more than 10 years old, it's time for a replacement. First Alert's Smoke / CO Warranty begins at the ... , Jul 19, 2019 · 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) Buy it with This item: FIRST ALERT BRK SC9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 Pack & Alert BRK 9120B-3 Hardwired Smoke Alarm ... , SKU: 9120BA. 4.5 / 5.0. (876 Reviews) WHERE TO BUY. 120-volt hardwired smoke alarm wires directly into your home's electrical system. Ionization smoke sensor reliably detects particles from fast-flaming fires. Hassle-free installation, no need to rewire. Easy-to-access battery drawer; 9-volt battery included. , 1 How to Install this Smoke Alarm. 2 If this Smoke Alarm Sounds. 3 Understanding the Indicator Lights and Alarm Horn Patterns. 4 Regular Maintenance. 5 Using the Silence …, CO605 Plug-in Battery Backup Carbon Monoxide Alarm and FIRST ALERT 9120B Smoke Detector Alarm | Hardwired with Backup Battery. 4.7 out of 5 stars. 32. $43.11 $ 43. 11. FREE delivery. FIRST ALERT. BRK CO5120BN Hardwired Carbon Monoxide (CO) Detector with Battery Backup , White. 4.7 out of 5 stars. 1,256. ... first alert model …, If service is required, do not return the product to your retailer. To obtain warranty service, please contact First Alert Support. Please have the model number and date of purchase available when calling. 1-800-323-9005 Mon-Fri (9 am - 8 pm CST) Sat-Sun (9 am - 5:30 pm CST) 10-Year Sealed Battery Smoke/CO Warranty Service and Returns, 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) Buy it with This item: FIRST ALERT BRK SC9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 Pack & Alert BRK 9120B-3 Hardwired Smoke Alarm ..., Consultez gratuitement le manuel de 9120B de First Alert ou posez votre question à d'autres propriétaires de 9120B de First Alert. ModesdEmploi. fr. ModesdEmploi. fr. ... Model 9120B Input: 120V AC ~, 60 Hz, 0.04A. ... equirements, including UL217 and are designed to detect particles of. combustion. Smoke particles of varying number and size …, 3 x Siterwell Smoke Alarm 10 Year Battery Smoke Detector Photoelectric Alarms. $37.04. Trending at $40.99. Find many great new & used options and get the best deals for BRK First Alert 9120B Smoke Detector at the best online prices at eBay! Free shipping for many products!, User guide • Read online or download PDF • First Alert 9120B User Manual • First Alert Safety Manuals Directory ManualsDir.com - online owner manuals library Search, Learn how to remove a First Alert smoke, CO, or combo smoke/CO alarm from its mounting bracket. ... If you're not sure how to remove a particular model, check the user manual. Related Articles. Ceiling or Wall Smoke Alarm Installation. Number of Views 9.41K. Alarm Chirps with New Battery. Number of Views 339.78K. Activate the …, Rated 4.90 out of 5 based on 58 customer ratings. $ 12.95. The First Alert 9120B is an affordable hardwired Smoke Alarm alarm providing accurate sensing technology, easy installation, and connectivity. Bulk Quantity discounts are available – send us a message to receive a quote!, The model number is 9120B, and it is a smoke alarm. The device requires one battery, which is not included. It features a battery backup and comes with a unit quantity of one. The First Alert BRK 9120B smoke alarm is an essential home security device that will keep you and your family protected., The total length of wire interconnecting the units should be less than 1000 feet (300 meters), and the maximum number of interconnected units on the same circuit is 18 total units, with 12 of those being smoke detectors. All modern hardwired First Alert, Onelink, and BRK alarms use the same wiring technology, and can interconnect.