First alert model number 9120b

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Input your model number and select your product. 4. Click Download product manual. Online Manuals for Popular Models. Review the chart to find manuals for common First Alert, Onelink, and BRK products. If your model isn’t listed here, follow the steps in the previous section to locate it.Pull the latch with your finger and the battery compartment will swing out. Remove the old batteries and press the test/silence button for 15 seconds. This drains any residual low power from the old batteries. Insert a fresh 9-volt battery, and your fully powered smoke alarm will stop chirping.Enter Your Email Address. I Want In. 800.438.8898. Live Chat. Find First Alert HARDWIRED SMOKE ALARM WITH BATTER 9120B at Parts Town with fast shipping.The dual-sensor technology of the 3120B model ensures a higher level of sensitivity, detecting both smoldering and fast-flaming fires effectively. On the other hand, the 9120B model’s single ...Summary of Contents for First Alert 9120B. Page 1 Position the base of the Smoke Alarm over the mounting bracket and turn. The Fire Department for detailed fire protection …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.

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.28 Dec 2019 ... ... (9 volt battery) in a First Alert plug in smoke detector and carbon monoxide detector. First Alert Model No. 9120B First Alert 9120B.Current First Alert, Onelink, and BRK alarms use the same wire harness. Refer to our guide, Install a Hardwired Alarm, for more installation information. ... Number of Views 16.56K. Find a replacement alarm model. Number of Views 20.03K. Replacement Mounting Brackets. Number of Views 2.9K. About alarm life expectancy / expiration. Number of …Frequently bought together, First Alert BRK Brands 9120B Hardwired Smoke Alarm with Battery Backup, Single 500+ bought since yesterday, Duracell Coppertop 9V Battery, Long Lasting Batteries, 4 Pack, $14.97, was $18.68, rated 4.6 of out 5 stars from 1018 reviewsBRK Electronics First Alert 9120B-48B 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm - Saving 48-Pack Our Price: $20.38 Our Price: $18.48The First Alert 9120BFF is a white smoke alarm. It is hard wired, which means it uses your own electrical system to have power and be able to function. It is a reasonably compact alarm, measuring 5.6” in diameter by 2” in height. It also comes with a 9V battery backup, which ensures that the alarm will continue to function even if there is ...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. Easy Installation: Perfect Mount System …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) …

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.Product Details. Power Source: Hardwired. Battery Backup: 9V. Sensor: Ionization. Interconnect: Can be linked with up to 18 units (12 Smoke, 6 …Jun 1, 2006 · 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 ... How to Install Hard Wired Smoke Detector - Easy Installation First Alert Smoke Detector Model 9120BFirst Alert Smoke Detector (9120B): https://amzn.to/3FMIoQ...

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SKU: 1046848. The First Alert SMI105-AC Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup uses First Alert's Precision Detection advanced sensing technology and meets new industry standards. Interconnect multiple alarms together to help provide an early warning throughout your whole home and have peace of mind knowing the 10-year ...First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack. ... ‎First Alert : Part Number ‎SC9120BFF-12 : Item Weight ‎11.2 ounces : Product Dimensions ‎5.6 x 5.6 x 2.2 inches : Item model number ‎SC9120BFF-12 : Batteries ‎1 9V batteries required. (included) Color ‎White : Power Source ‎Battery Powered : Item … BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup. 3,188. 3K+ bought in past month. $4090. FREE delivery Mar 20 - 22. Or fastest delivery Tue, Mar 19. More Buying Choices. $27.90 (44 used & new offers) More results. The dual-sensor technology of the 3120B model ensures a higher level of sensitivity, detecting both smoldering and fast-flaming fires effectively. On the other hand, the 9120B model’s single ...

The model number can be helpful if you are searching online for a product manual, or troubleshooting with First Alert Support. Find an extinguisher's serial number: The serial number can be found in a black box after the word, "No." Note: In the example above, EX3622 is not a model number or serial number. It is the UL listing number. Find an ...First Alert 9120LBLA Hardwire Smoke Alarm with 10 Year Battery in Combination Smoke & Carbon Monoxide Detectors. ... 9120B. 9120LBL. 9210A. Pattern Name: Smoke Alarm . ... Item model number ‎9120LBLA : Style ‎9120LBL : Pattern ‎Smoke Alarm : Power Source ‎Hand Powered : Item Package Quantity ‎1 : Item Weight ‎280 g : Country of origin …View and Download First Alert SC9120B user manual online. AC Powered Smoke & Carbon Monoxide Alarm with Battery Back-up, Silence Feature and Latching Alarm. ... Smoke particles of varying number and size are. ... Page 1 Smoke Alarm Models 9120, 9120B, SC6120B, Consumer Affairs: (800) 323-9005 • Connect the white wire on the … Shop First Alert Brk 12-Pack Hardwired Ionization Sensor Smoke Detector in the Smoke Detectors department at Lowe's.com. The BRK 9120B Hardwired Smoke Alarm with Battery Backup. This 120 volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, Find the model number, serial number and other important information about a Goodman furnace on its data tag, usually on or inside the door. Open the door on the upper compartment ...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. Number of Batteries. 1. Features. Battery Backup. Type. Smoke Alarm. Smart Home Protocol. Bluetooth. Dimensions. Item Width. 1.9 in. Item Weight. ... item 5 First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack. $75.39. ... Airthings … Shop First Alert BRK Hardwired Ionization Sensor Smoke Detector in the Smoke Detectors department at Lowe's.com. The BRK 9120B Hardwired Smoke Alarm with Battery Backup. This 120 volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, Battery back-up (Model 7010B only):Keeps alarm functioning during a power interruption provided battery is fresh and installed properly. 1 All First Alert® and BRK® Smoke Alarms conform to regulatory requirements, including UL217 and are designed to detect particles of combustion. Smoke particles of varying number and size are produced in all ...

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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 ...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.Kohler toilets have one-piece and two-piece models. When you need to replace a part, you’ll need the Kohler toilet model number. Model numbers are four digits long sometimes preced...I had to take down one of the smoke detectors in the house today because it was faulty and was beeping at random times of the day/night for no reason. The ma...A number model is a sentence that shows how a series of numbers are related. An example of a basic number model could be 12+3=15. A number model is an equation that incorporates ad...‎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 ...I have in the last two years approximately 3-4 cheap($5.00) First Alert (same model) smoke detector begin chirpings within months of purchase and batteries are good. I ended up throwing them away because I had disposed of my receipts . Just yesterday one I have had since 17 June 2017 began chirping and again the battery was good.

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9120B-48P Hardwired Ionization Smoke Alarm w/Battery Backup-Box Pack ... Smart Technology - helps reduce the number of nuisance alarms; Perfect Mount - allows for easy alignment of alarm; Connection to AC power is made with a "Quick-Connect" wiring harness. Installation is quick, easy and cost effective. ... First Alert; Resideo; Sustainability; …Learn how to replace an old hardwired smoke or CO alarm with a brand-new one. First Alert Smoke and CO Alarm Disposal / Recycling. Learn how to properly dispose of old detectors. Find more information about your First Alert or BRK product, including manuals, tutorials, and more.Related Manuals for First Alert 9120B . Carbon Monoxide Alarm First Alert SC9120B User Manual 11 pages. Smoke & carbon monoxide alarm. Smoke Alarm First Alert 9120 Manual Del Usuario 8 pages. First alert smoke alarm - fire smoke detector user manual. Smoke Alarm First Alert 9120 User Manual 7 pages. Ac powered ionization smoke alarm with …7 days per week (8am - 10pm CST) Phone Number: 1-833-663-5465. INTERNATIONAL SUPPORT. For international support (outside of the United States and Canada), check out our worldwide locations. For all European areas, provide phone 0 800 2793643 or general EMEA First Alert support email: [email protected] had a false alarm on a First Alert hardwired photoelectric alarm (model SC7010BV) at 1:30am!!! I bought all of these alarms in Costco 2-packs about 2 years ago. Mfg date on the back of the malfunctioning alarm is 2022 Apr 27 - L11.User Manual First Alert 9120BFF 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 1-Pack. Documents for First Alert 9120BFF. The following documents are available: ... Model 9120B. Input: 120V A C ~, 60 Hz, 0.04A. ... equirements, including UL217 and are designed to detect particles of. combustion. Smoke particles of varying …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 …The BRK 9120B Hardwired Smoke Alarm with Battery Backup. This 120 volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, ... Model #9120BP-12ST. Shop First Alert. 100+ …Here is how you change the battery in a First Alert smoke detector with a slide-out drawer for the battery. Thank you for watching and don't forget to test ...Thank you for choosing BRK Brands, Inc. for your Smoke Alarm needs.First Alert BRK9120B BRK 9120B Smoke Detector HOW TO INSTALL PhotoElectric DETAILED VIDEO EASY !! Buy it HERE! Amazon Link: https://amzn.to/2ZTxWWVSupport ch...Jan 1, 2008 · ‎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 ... ….

‎FIRST ALERT : Style ‎SA9120BPCN : Power Source ‎Battery Powered : Color ‎white : Item Weight ‎0.01 Ounces : Alarm ‎Audible : Sensor Type ‎Ionization : Manufacturer ‎First Alert : 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 ...The location of the model number on a Sentrysafe safe unit depends on the type of safe purchased. On fire-protected models, the model number is located on the faceplate, which is n...4.8 / 5.0. (334 Reviews) WHERE TO BUY. The First Alert SC9120B Hardwired Combination Smoke and Carbon Monoxide Alarm is a hardwire alarm with battery …Apr 4, 2014 · I have in the last two years approximately 3-4 cheap($5.00) First Alert (same model) smoke detector begin chirpings within months of purchase and batteries are good. I ended up throwing them away because I had disposed of my receipts . Just yesterday one I have had since 17 June 2017 began chirping and again the battery was good. This PDF user manual is for the First Alert 9120B AC Powered Smoke Alarm with Battery Back-up and Silence. First Alert 9120B AC Powered Smoke Alarm with Battery Back-up and Silence. SKU: 9120B UPC: 029054513014. Designed to help promote household safety, the First Alert Hardwired Smoke Alarm with Battery Backup can provide early …28 Dec 2019 ... ... (9 volt battery) in a First Alert plug in smoke detector and carbon monoxide detector. First Alert Model No. 9120B First Alert 9120B.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. $43.27 $ 43. 27. FREE delivery. FIRST ALERT. BRK SC9120B Hardwired Smoke and Carbon Monoxide Detector with Battery Backup and FIRST ALERT BRK9120b6CP Smoke Detector Alarm …Shop First Alert Brk 12-Pack Hardwired Ionization Sensor Smoke Detector in the Smoke Detectors department at Lowe's.com. The BRK 9120B Hardwired Smoke Alarm with Battery Backup. This 120 volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, First alert model number 9120b, 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 …, 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. $38.77 $ 38. 77. FREE delivery. FIRST ALERT. ... first alert model sc9120b replacement sc9120b first alert 9120b replacement ..., In today’s digital age, earning money online has become easier than ever before. Whether you’re looking to supplement your income or replace your full-time job, there are numerous ..., An end-of-life timer lets you know when the device should be replaced. Model: SA3210. Dual Sensor Smoke Alarm with 10-Year Sealed Battery. Model: P1210E. 10-Year Battery Photoelectric Smoke Alarm, Slim Profile with Escape Light. Model: CO710. Carbon Monoxide Alarm with 10-Year Battery and Digital Temperature Display., See the table below to identify your model number and Latching Alarm light pattern: LED Color Latching LED Blinking Pattern; Smoke Alarms: 9120 Series ... SC7010 Series: Red: 2 seconds on, 2 seconds off: Heat Alarm: HD6135B: Red: Blinks on and off every 5 seconds: Related Articles. First Alert Compatibility: Ways to Interconnect Smoke and/or CO …, 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:, Shop for a First Alert smoke and carbon monoxide alarm or other fire safety products from a brand you can trust. We offer a wide variety of products to keep your home and family safe from fire, gas, CO2 and other hazards. ... and contain at least 1 number, 1 upper case letter, and 1 lower case letter. Confirm password. Show password. Sign up. ... Model: …, Model # 9120B. Store SKU # 1000498474. Store SO SKU # 1000498474. BRK. Brands 120-Volt Hardwire, Ionization Sensor Smoke Alarm Detector Perfect Mount with Battery Backup , If your smoke alarm is chirping even though it has a new battery, try these troubleshooting steps to clear out residual charge from the old battery. Remove the alarm from your ceiling or wall. Open the cover and take out the battery. Press and hold the test button for 15-30 seconds. This will fully reset the smoke alarm and drain any charge ..., 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!, 19 Oct 2023 ... First Alert SC9120B combination smoke and carbon monoxide alarm test. · Comments1., First Alert 9120BA User Manual View and Read online. Est. reading time 32 minutes. 9120BA Smoke Alarm manuals and instructions online. ... Smoke particles of varying number and size are produced in all fires. ... warranty service, contact the Customer Service Team at 1-800-323-9005 To assist us in serving you, please have the model …, Product Details. Power Source: Hardwired. Battery Backup: 9V. Sensor: Photoelectric. Interconnect: Can be linked with up to 18 units (12 Smoke, 6 CO/Heat/Relay) Optipath 360° Technology: Patented technology provides 360° of direct access to the smoke sensor. Noise Output: 85 dB in a T3 Pattern. Single Button: One press to silence and test alarm., First Alert 9120B Smoke Alarm User Manual. Open as PDF ... Model 9120B. Input: 120V AC ~, 60 Hz, 0.04A. ... Smoke particles of varying number and size are produced., If your smoke alarm is chirping even though it has a new battery, try these troubleshooting steps to clear out residual charge from the old battery. Remove the alarm from your ceiling or wall. Open the cover and take out the battery. Press and hold the test button for 15-30 seconds. This will fully reset the smoke alarm and drain any charge ..., User Manual First Alert 9120BFF 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 1-Pack. Documents for First Alert 9120BFF. The following documents are available: ... Model 9120B. Input: 120V A C ~, 60 Hz, 0.04A. ... equirements, including UL217 and are designed to detect particles of. combustion. Smoke particles of varying …, 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 ..., ‎First Alert (Canada) Inc. Place of Business ‎AURORA, IL, 60504 US : Part Number ‎9120BA : Product Dimensions ‎15.24 x 5.08 x 15.24 cm; 320 g : Batteries ‎1 9V batteries required. (included) Item model number ‎1039264 : Style ‎9120B : Pattern ‎Smoke Alarm : Power Source ‎Corded Electric, Battery Powered : Item Package Quantity ..., Shop for a First Alert smoke and carbon monoxide alarm or other fire safety products from a brand you can trust. We offer a wide variety of products to keep your home and family safe from fire, gas, CO2 and other hazards. ... and contain at least 1 number, 1 upper case letter, and 1 lower case letter. Confirm password. Show password. Sign up. ... Model: …, Order Status Lookup. Please enter the numerical part of your order number and your email address. Thank you for ordering safety products from FirstAlertStore.com, First Alert is the most trusted and recognized brand for home safety in America. Revolutionizing the smoke alarm and carbon monoxide detector field to help you protect what matters most!, 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!, 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., Smoke Alarms. AC Powered Ionization Alarm with Silence Latching Features. Model 9120. Input: 120V AC ~, AC Powered Ionization Alarm with Battery Silence and Latching. Model 9120B. Input: 120V AC ~, Printed in Mexico. M08-0134-003 K1., Model #1040489. Shop First Alert. 100+ views last week. Get Pricing & Availability . ... Package Quantity: 12. 1. 3. 6. 12. Overview. The BRK 9120B Hardwired Smoke Alarm with Battery Backup. This 120 volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast flaming fires and alerts you with a loud 85 decibel …, Learn more about First Alert and BRK. Loading. ... Number of Views 1.87K. About Discounts or Coupons for First Alert, Onelink, and BRK Products. Number of Views 717. Lost Safe Keys or Combinations for First Alert Branded Safes. Number of Views 47.16K. Are First Alert, Onelink, or BRK Alarms HUD-Compliant? Number of Views 598. How …, Free returns on most items within 30 days. 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. , First Alert. 9120B. User Manual. First Alert 9120B User Manual. Download. Like. Full screen Standard. Page of 7 Go. INTRODUCTION. Thank you for choosing BRK Brands, Inc. for your Smoke Alarm needs. You have purchased a state-of-the-art Smoke Alarm designed to provide you with early warning of a fire. ... (Model 9120B only). Improved …, If you need to replace an old Firex or Kidde alarm with a First Alert or BRK model, check out our guide: ... Number of Views 3.44K. Will replacement alarms fit my old alarm's base and/or wire harness? Number of Views 13.65K. Backup Batteries in Hardwired Alarms. Number of Views 5K. What’s the maximum amount of hardwired smoke alarms I can …, 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 …, When it comes to finding the perfect microwave for your kitchen, GE is a brand that stands out. With its wide range of models and features, there’s a GE microwave model number to s..., Input your model number and select your product. 4. Click Download product manual. Online Manuals for Popular Models. Review the chart to find manuals for common First Alert, Onelink, and BRK products. If your model isn’t listed here, follow the steps in the previous section to locate it., Jan 29, 2024 · The dual-sensor technology of the 3120B model ensures a higher level of sensitivity, detecting both smoldering and fast-flaming fires effectively. On the other hand, the 9120B model’s single ... , First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack. $68.99 $ 68. 99. Get it as soon as Monday, May 13. In Stock. ... ‎First Alert : Part Number ... Item model number ‎SC9120B-3 : Batteries ‎2 AA batteries required. (included) Is Discontinued By Manufacturer ‎No : Size ‎3-Pack : Pattern ‎Detector : Item Package …