Brk 4120b replacement

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 …

General Help. Remove an Alarm from the Ceiling or Wall. Learn how to remove a First Alert smoke, CO, or combo smoke/CO alarm from its mounting bracket. Find a replacement alarm model. Learn how to find a replacement smoke or CO alarm. Will replacement alarms fit my old alarm's base and/or wire harness?BRK Smoke Alarm Replacement. This BRK Electronics 9120B smoke alarm is the direct replacement for the discontinued BRK smoke alarm models 4120B, 4120SB, 4919 and 86RAC. Wiring harness and communication protocol is the same across BRK models (i.e. a 4120B will talk to a 9120B). When replacing an older smoke detector, only the mounting …[email protected]. 1 (803)-992-5864. Name. Phone. Email. Subject. Message. Thanks for submitting! NeXtGen Medical offers numerous services that include …Brk electronics smoke detector 4120b replacement : lean how to installSmoke alarm alert brk first battery monoxide carbon hardwired backup hardwire interconnected grainger combination detectors review boolpool depot zoom roll Brk electronics smoke detector 4120b replacement : lean how to installBrk electronic smoke …Smoke alarm strobe 3v photoelectric brk impaired backup hearing battery 120v wire ac light hz dc some sensor volt aaBrk electronics smoke detector 4120b replacement : lean how to install Brk electronics smoke detector model no 86rac : ® hd6135f heat detectorAmazon deal: first alert brk hardwired smoke detector.

Add your card. This item: FIRST ALERT BRK 9120LBL Hardwired Smoke Detector with Battery Backup. $2393. +. First Alert BRK SC9120LBL Hardwired Smoke and Carbon Monoxide (CO) Detector with 10 Year Sealed Battery Backup , White. $4475. +. First Alert 0827B Ionization Smoke Alarm with 10-Year Sealed Tamper-Proof Battery , White , Pack of 1. $2155.The Kidde KA-B quick convert adapter allows for easy installation of a new Kidde alarm to an existing wiring harness. The KA-B model can only be used with First Alert model SA4121B and BRK models 4120, 4919, 5919, and 86RAC, with plug in connectors manufactured before June 1, 2003. This quick convert adapter is compatible with Kidde …BRK ADF-12 BRK Smoke Alarm Adapter Plug for Firex Hardwire Smoke Alarms, White/Black, Pack of 12. 4.5 out of 5 stars. 527. 100+ bought in past month. $20.50 $ 20. 50. List: $24.99 $24.99. ... brk electronics 4120b replacement first alert sc9120b brk 9120b smoke detector ...BRK ADF-12 BRK Smoke Alarm Adapter Plug for Firex Hardwire Smoke Alarms, White/Black, Pack of 12. 4.5 out of 5 stars. 527. 100+ bought in past month. $20.50 $ 20. 50. List: $24.99 $24.99. ... brk electronics 4120b replacement first alert sc9120b brk 9120b smoke detector ...Brk 9120b usuario 120v manualzzBrk 83r manualzz detector Brk smoke detector manual 9120baBrk electronics smoke detector 4120b replacement : lean how to install. Brk electronics smoke detector 4120b replacement : lean how to installBrk sc9120b Brk alarm alert smoke manual first backup alarms silence battery featureBrk electronics …

5.0 out of 5 stars Easy replacement for BRK 4120B. Reviewed in the United States on June 29, 2020. Size: 3-PackStyle: 9120BPattern Name: Filter Verified Purchase. My house has nine smoke alarms - seriously, nine of them. Certainly overkill but they're all wired together and it would have been more work for me to remove a few and patch/paint the ...General Help. Remove an Alarm from the Ceiling or Wall. Learn how to remove a First Alert smoke, CO, or combo smoke/CO alarm from its mounting bracket. Find a replacement alarm model. Learn how to find a replacement smoke or CO alarm. Will replacement alarms fit my old alarm's base and/or wire harness?4120B. 4120SB. M06-2016-007 06/00. User’s Manual. Smoke Alarms. Ionization smoke alarms are generally more effective at detecting flaming fires which consume. combustible materials rapidly and spread quickly. Sources of these fires may include paper burning in a. wastebasket, or a grease fire in the kitchen.120VAC Hardwired Smoke Alarm w/ Battery Backup Features: 120vac hardwired, easily replace existing or install new hardwired alarms into home's electrical system. Battery backup provides added safety during power outages. Mute button silences unnecessary alarms. This feature also tests alarm functions with same button.Recommended replacement for the following obsolete models: BRK 4120B; BRK 4120SB; BRK 86RAC; BRK 9120; First Alert SA4120B; First Alert SA4121B; First Alert SA4919B; All BRK Electronics smoke alarms meet UL 217 standard and are listed with the California State Fire Marshal.

Joe lunardi's current bracketology.

Dr. Hilton is dedicated to promoting the ongoing good health, well-being, and self-esteem of all of her patients at Southeast Sculpting + Rejuvenation. Trusted OBGYN serving Fort …Brk Electronic 4120B Manuals Check Details Brk electronics smoke detector 4120b replacement : lean how to install. Brk electronics smoke detector 4120b keeps chirping noise : is yourBrk manualslib alarm Brk first alert smoke alarm manualSmoke carbon monoxide alarm brk combo alert first hardwired battery brands detector year backup sealed wired ...*Disclosure, these are amazon affiliate links. If you purchase a product or service with the links that I provide I may receive a small commission. There is...To find a replacement for an old smoke or CO alarm, search for your model number in the First Alert Help Center: Click the search icon at the top of the page. Type the model number you want to find a replacement for. Choose your model to view its product help page and updated model number (if applicable). If your alarm is more than 12-20 years ...Replace a Kidde or Firex Alarm with First Alert or BRK Model. Learn how to replace an old hardwired smoke or CO alarm with a brand-new one.BRK 3120B-6 Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup, 6-Pack , White. 4.4 out of 5 stars. 2,444. 200+ bought in past month. $157.54 $ 157. 54. FREE delivery Fri, May 3 . FIRST ALERT. FG200B Family Gard Basics Smoke Alarm, 2 Count (Pack of 3) | Battery Operated Smoke Detector , White.

Brk Electronics Smoke Detector 4120b Replacement brk-electronics-smoke-detector-4120b-replacement 4 Downloaded from cdn.ajw.com on 2022-02-04 by guest Fact-Checking eBook Content of Brk Electronics Smoke Detector 4120b Replacement Distinguishing Credible Sources 13. Promoting Lifelong Learning Utilizing …Smoke alarm strobe 3v photoelectric brk impaired backup hearing battery 120v wire ac light hz dc some sensor volt aaBrk electronics smoke detector 4120b replacement : lean how to install Brk electronics smoke detector model no 86rac : ® hd6135f heat detectorAmazon deal: first alert brk hardwired smoke detector.If you’ve ever had to replace a windshield, you know it’s not a cheap fix. The cost can vary depending on the make and model of your car, but the average cost for windshield replac...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.Cat. 4120B Input: 120V AC, 60Hz, 0.5A Model 4120B 4120SB M06-2016-007 06/00 User’s Manual Smoke Alarms Ionization smoke alarms are generally more effective at detecting flaming fires which consume combustible materials rapidly and spread quickly. Sources of these fires may include paper burning in a wastebasket, or a grease fire in the [email protected]. 1 (803)-992-5864. Name. Phone. Email. Subject. Message. Thanks for submitting! NeXtGen Medical offers numerous services that include …Home > BRANDS > BRK Electronics > First Alert Obsolete Models > First Alert BRK SA4120B 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm (Upgraded to 9120B) Alternative Views: When ordering this, we will upgrade to a current model, a plug-n-play unit.The hip replacement joke, “Hip replacement? He was never hip to begin with!” is written to go along with a hip replacement cartoon by Marty Bucella that jokes about the character’s...Cat. 4120B Input: 120V AC, 60Hz, 0.5A Model 4120B 4120SB M06-2016-007 06/00 User’s Manual Smoke Alarms Ionization smoke alarms are generally more effective at detecting flaming fires which consume combustible materials rapidly and spread quickly. Sources of these fires may include paper burning in a wastebasket, or a grease fire in the ...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. Model: User’s Manual: 1039102. 1039102 manual. 1042136. ... Request a Replacement Manual on Paper. If you need a hard copy of a First Alert manual, we'll gladly send you ...

SKU: 7010B. Hardwired smoke alarm with replaceable battery backup. AC 120V Interconnectable with Silence and Latching features. Includes Photoelectric smoke sensing technology and a 9V Carbon Zinc battery. Select a Model: 7010B Hardwired Photoelectric Smoke Alarm with Battery Backup.

The BRK & First Alert 9120B was introduced in 2004 as a replacement for the 4120B [3]. The old plastic ionization chamber with a metal top was replaced by an all metal chamber to shield electrical noise. The integrated circuit (IC) was upgraded. The BRK 9120 can be interconnected to other compatible BRK Smoke Alarms [2].Find helpful customer reviews and review ratings for First Alert SA9120BPCN Smoke Alarm with Adapter Plugs for Easy Replacement (Pack of 2) at Amazon.com. Read honest and unbiased product reviews from our users. 5.0 out of 5 stars Easy replacement for BRK 4120B. Reviewed in the United States on June 29, 2020. Size: 3-PackStyle: 9120BPattern Name: Filter Verified Purchase. Kidde smoke and carbon monoxide detector manualBrk first alert smoke alarm manual 83r brk manualzz detectorBrk electronic 4120b manuals. Brk Electronics Smoke Detector 4120B Replacement : Lean how to install. Check Details. Brk first alert, sc9120b battery operated smoke detectors– wholesale home. Brk electronic 83r smoke …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.First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup. 2,737. $3400. FREE delivery Oct 27 - Nov 2. Or fastest delivery Wed, Oct 25. Only 2 left in stock - order soon. More Buying Choices. $33.90 (42 new offers) Another way to buy.Amazon.com: Brk 4120b Replacement. 11 results for "brk 4120b replacement" Results. Overall Pick. FIRST ALERT. BRK 7010B Hardwired Smoke Detector with Photoelectric …Brk smoke carbon monoxide alarmMonoxide carbon alert brk first smoke alarm detector combination pack walmart volt battery 3x backup hardwire Brk electronic smoke alarm user manual pdf downloadBrk electronics smoke detector 4120b replacement : lean how to install a smoke alarm in this.

Night clubs indianapolis indiana.

Towable backhoe.

120VAC Hardwired Smoke Alarm w/ Battery Backup Features: 120vac hardwired, easily replace existing or install new hardwired alarms into home's electrical system. Battery backup provides added safety during power outages. Mute button silences unnecessary alarms. This feature also tests alarm functions with same button.View and Download BRK electronic 4120 AC user manual online. BRK Electronics SMOKE ALARMS USER'S MANUAL 4120SB, 4120B, 4120 AC. 4120 AC smoke alarm pdf manual download. Also for: 4120sb, 4120sab, 4120b, 4120ab, 4120. ... All the batteries specified above are acceptable replacement batteries for this unit. Page 18: Using The …KA-B2. Helps you to quickly replace First Alert® or BRK® wire-in smoke alarms. The KA-B2 can only be used when replacing the following models that have a plug in connector and are manufactured before June 1, 2003: First Alert® models: SA4121B BRK® models: 4120, 4919, 5919, 86RAC. The KA-B2 adapter can be used on all AC/DC Kidde smoke and ...4120B-48P 9120B-48P AC/DC BRK Smoke 48 pack 4120B-GFD 9120B-GFD AC/DC BRK Smoke Gravity Feed Display 4120LB 9120LB AC/DC BRK Smoke w/Lithium Battery 4120SAB Obsolete Not needed-Silence is a standard feature 4120SB Obsolete Not needed-Silence is a standard feature 4120SB-12ST 9120B-12ST AC/DC BRK Smoke 12 pack …Kidde smoke and carbon monoxide detector manualBrk first alert smoke alarm manual 83r brk manualzz detectorBrk electronic 4120b manuals. Brk Electronics Smoke Detector 4120B Replacement : Lean how to install. Check Details. Brk first alert, sc9120b battery operated smoke detectors– wholesale home. Brk electronic 83r smoke …BRK 4120B Smoke Alarm AC Powered with Battery Back-up. Designed for the fastest possible installation! If AC power fails, the battery back-up keeps the smoke alarm working. The BRK 4120B can be interconnected with up to 11 additional BRK smoke detectors and 6 compatible devices such as bell, repeaters, or switches. Watch on. If you need to replace an old Firex or Kidde alarm with a First Alert or BRK model, check out our guide: Replace a Kidde or Firex Alarm with First Alert or BRK Model. Learn how to replace an old hardwired smoke or CO alarm with a brand-new one. General Help. Remove an Alarm from the Ceiling or Wall. Learn how to remove a First Alert smoke, CO, or combo smoke/CO alarm from its mounting bracket. Find a replacement …10-Year Limited Warranty On Alarm. Model #. 4120B. Operating Voltage. 120V AC 60Hz w/ 9V battery backup (4120B only) Interconnections. Up to 11 additional BRK smoke detectors and 6 compatible devices such as bell, repeaters, or switches. Listing. UL Listed to U.S. and Canadian safety standards.Q: Our home’s existing hardwired interconnected smoke alarm system uses BRK 86RAC (BRK Electronics, model # 86RAC) units, some of which need to be replaced. Apparently, the newer model “BRK 9120B is a direct replacement,” for it. Does that mean that we can leave the existing 86RAC Mounting Brackets and wiring in place and use them for the ...PAGE 1. User’s Manual Smoke Alarms • AC Powered Ionization Smoke Alarm with Battery Back-Up and Silence Feature Cat. 4120SB Input: 120V AC, 60Hz, 0.5A AC Powered Ionization Smoke Alarm with Battery Back-up Cat. 4120B Input: 120V AC, 60Hz, 0.5A Ionization smoke alarms are generally more effective at detecting flaming fires which … ….

Yes. You can replace a smoke detector with a combination smoke/CO unit. All modern First Alert and BRK alarms use the same wire harness and connector. If the alarms in your home are interconnected with 120V AC interconnection, keep in mind that only CO and combination detectors will alarm in the event of a high CO condition.Product Details. First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack. by FIRST ALERT. 4.7 out of 5. 30,365 global ratings. ›. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in.What is the best smoke and carbon monoxide detector replacement for my BRK Electronics Model No. 4120B smoke detector (120 Vac, 40 Hz, 0.05 A), preferably one with similar dimensions that can be order … read moreThe rules should oblige the seller to give the purchaser an operating instrucion of BRK electronic 4120B, along with an item. The lack of an instruction or false information given to customer shall constitute grounds to apply for a complaint because of nonconformity of goods with the contract. In accordance with the law, a customer can receive ...BRK Electronics First Alert ADF Adaptor plugs to replace a Firex Smoke Alarm (pack of 1) All of the listed BRK and First Alert Alarms are compatible with the listed FIREX Alarms and will work with the enclosed Adapter Plugs. Maximum of only 12 units (except model G-6) may be interconnected. Check for model numbers above.Discover the amazing features of the BRK 4120B smoke detector for 2023. Ensure your safety with this incredible smoke detector. Discover the amazing features of the BRK 4120B smoke detector for 2023. ... Battery replacement: Replace the 9V battery at least once a year or as indicated by the device's low battery warning chirp.Find more information about your First Alert or BRK product, including manuals, tutorials, and more.This Smoke Alarm must have AC or battery power to operate. If the AC power fails, battery back-up will allow the alarm to sound for at least 4 minutes. If AC power fails and the battery is weak, protection should last for up to 7 days. If AC power fails and the battery is dead or missing, the alarm cannot operate.First Alert Brk 3-Pack Hardwired Ionization Sensor Smoke Detector. Item # 1620738 |. Model # 1039750. Get Pricing & Availability. Use Current Location. Hardwired ionization smoke alarm with 9-volt battery back-up. Latching alarm indicator - remembers which unit initiated an alarm.Replacing a roof is a major home improvement project that can be expensive. Knowing the cost of replacing a roof is important for homeowners who are considering this type of projec... Brk 4120b replacement, Where to Buy First Alert or BRK Brands Products. Number of Views 1.68K. Replace an Old Hardwired Alarm. Number of Views 11.97K. First Alert and BRK Brands., Welcome to the BRK Help Center. Search. Search "" Find answers about a product: Smoke Alarms. CO Alarms. Combo Alarms. Fire Extinguishers. Wireless Interconnect ... , The breakers in your home stop the electrical current and keep electrical circuits and wiring from overloading if something goes wrong in the electrical system. Replacing a breaker..., BRK 9120B AC Powered Smoke Alarm with Battery Back-up, Silence, Latching and Perfect Mount System. Voltage: 120 Volt AC; Interconnectable. Dimensions: 5.58”dia x 1.97”H. Features: Battery back-up with 9V Battery INCLUDED. Dual Chamber Ionization Sensor. Side load battery drawer with lock and Battery pull tab., BRK 7010B Hardwired Smoke Detector with Photoelectric Sensor and Battery Backup , White. 3,343. 500+ bought in past month. $2182. FREE delivery Wed, Mar 13 on $35 of items shipped by Amazon. More Buying Choices. $16.60 (64 used & new offers) , *Disclosure, these are amazon affiliate links. If you purchase a product or service with the links that I provide I may receive a small commission. There is..., Learn more about mounting brackets and wiring for replacement alarms. Replace an Old Hardwired Alarm Learn how to replace an old hardwired smoke or CO alarm with a brand-new one., BRK 4120B Smoke Alarm AC Powered with Battery Back-up. Designed for the fastest possible installation! If AC power fails, the battery back-up keeps the smoke alarm working. The BRK 4120B can be interconnected with up to 11 additional BRK smoke detectors and 6 compatible devices such as bell, repeaters, or switches., BRK Electronics First Alert SA3210 Dual Sensor DC 10-Year Sealed Lithium Battery Powered Photoelectric and Ionization Smoke Alarm. Our Price: $37.58. Add To Cart. BRK Electronics First Alert 9120B6CP 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm - Contractor 6-Pack. Our Price: $62.88., General Help. Remove an Alarm from the Ceiling or Wall. Learn how to remove a First Alert smoke, CO, or combo smoke/CO alarm from its mounting bracket. Find a replacement alarm model. Learn how to find a replacement smoke or CO alarm. Will replacement alarms fit my old alarm's base and/or wire harness?, If you need help with your First Alert 4120 series smoke alarm, visit the First Alert Help Center to access manuals, FAQs, and troubleshooting tips. Learn how to install, test, and maintain your alarm for optimal performance and safety., First Alert BRK 3120B Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup, Dual Sensing Smoke Alarm, 1-Pack 4.4 out of 5 stars 2,452 8 offers from $33.69, General Help. Remove an Alarm from the Ceiling or Wall. Learn how to remove a First Alert smoke, CO, or combo smoke/CO alarm from its mounting bracket. Find a replacement alarm model. Learn how to find a replacement smoke or CO alarm. Will replacement alarms fit my old alarm's base and/or wire harness?, CO5120BNA is a wire-in, 120 VAC 60Hz single and / or multiple station carbon monoxide alarm specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories and other multi-family dwellings as defined in standard NFPA 101. Model CO5120BNA complies with CAN/ULC S531., BRK 9120LBL Hardwired Smoke Detector with Adapter Plugs for Easy Replacement , White. 4.5 out of 5 stars. 407. ... BRK SC9120B Hardwired Smoke and Carbon Monoxide (CO ... , 9120B-48P Hardwired Ionization Smoke Alarm w/Battery Backup-Box Pack SKU: 9120B-48P , If you’ve ever had to replace a windshield, you know it’s not a cheap fix. The cost can vary depending on the make and model of your car, but the average cost for windshield replac..., 4120B REPLACEMENT BATTERY RECOMMENDATIONS Aurora, Ill. (June, 2005) – BRK Brands, Inc. recommends that when consumers replace the batteries in their BRK Brand hardwired battery back-up smoke alarms, models 4120B and 4120SB, manufactured prior to October 2000, they use replacement batteries that are of, Smoke Alarm - BRK Model 4120SB Teardown. The BRK & First Alert 4120 was introduced in 1998. It was replaced by the BRK 9120 in 2004 [3]. For Maximum Resolution, Click on the Body of a Picture. >. Front of BRK/First Alert Smoke Alarm Model 4120. BRK/First Alert Model 4120 Specifications on Box., BRK 9120LBL Hardwired Smoke Detector with Adapter Plugs for Easy Replacement , White. 414. 50+ bought in past month. $2549. List: $30.99. FREE delivery Tue, Apr 2 on $35 of items shipped by Amazon. Only 7 left in stock - order soon. More Buying Choices. $23.00 (27 new offers), We have 2 BRK electronic 4120B manuals available for free PDF download: User Manual . BRK Electronic 4120B User Manual (24 pages) BRK Electronics Smoke Alarm User's Manual 4120B, 4120SB, M06-2016-007. Brand: BRK Electronic ..., Recommended replacement for the following obsolete models: BRK 4120B BRK 4120SB BRK 86RAC First Alert SA4120B First Alert SA4121B First Alert SA4919B. How to Install First Alert 9120B6CP Hardwired Smoke Alarms: In this guide, we'll be showing you how to install First Alert Hardwired Smoke and Carbon Monoxide Alarms. Here are a few items …, Smoke alarm strobe 3v photoelectric brk impaired backup hearing battery 120v wire ac light hz dc some sensor volt aaBrk electronics smoke detector 4120b replacement : lean how to install Brk electronics smoke detector model no 86rac : ® hd6135f heat detectorAmazon deal: first alert brk hardwired smoke detector., Home > BRANDS > BRK Electronics > BRK Electronics Smoke Alarm > First Alert 9120B 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm (Upgraded to SMI100-AC) This BRK 9120B is a recommended replacement for the following old BRK / FirstAlert models: , Brk electronics smoke detector 4120b replacement : lean how to installSmoke alarm alert brk first battery monoxide carbon hardwired backup hardwire interconnected grainger combination detectors review boolpool depot zoom roll Brk 83r manualzz detectorBrk 5 5/8 in carbon monoxide and smoke alarm with 85 db @ 10 ft audible., Replacing a roof is an expensive and important job that can take a significant chunk out of your budget. Knowing the average cost to replace a roof can help you plan for the expens..., BRK Electronics First Alert SC6120B 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm and Carbon Monoxide Combo Alarm (Upgraded to SC9120B) Our Price: $39.58. Add To Cart. BRK Electronics First Alert SCO500 OneLink Wireless Battery Smoke/CO Combo Alarm with Voice (Upgraded to SCO500B) Our Price: $40.04. , This accessory relay is designed to activate auxiliary devices such as bells, lights and door closers. The RM3 Relay is intended for use with BRK Electronics Models 4120SB, 4120B, 4120, 4919, 5919, 5919TH and First Alert Models SA4121B, SA4120 and SA4919B. The relay contacts will activate whenever any interconnected Alarm sounds., Find what you need here. Call BRK Consumer Support. 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 the First Alert support team via email or phone. We're open 7 days a week., Replace a Kidde, Fyrnetics, or Firex Alarm with First Alert or BRK Model. Learn how to replace existing hardwired Kidde/Fyrnetics or Firex alarms with our patented easy …, 4120B REPLACEMENT BATTERY RECOMMENDATIONS Aurora, Ill. (June, 2005) – BRK Brands, Inc. recommends that when consumers replace the batteries in their BRK Brand hardwired battery back-up smoke alarms, models 4120B and 4120SB, manufactured prior to October 2000, they use replacement batteries that are of , Home > BRANDS > BRK Electronics > First Alert Obsolete Models > First Alert BRK SA4120B 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm (Upgraded to 9120B) Alternative Views: When ordering this, we will upgrade to a current model, a plug-n-play unit., BRK Electronics First Alert SA3210 Dual Sensor DC 10-Year Sealed Lithium Battery Powered Photoelectric and Ionization Smoke Alarm. Our Price: $37.58. Add To Cart. BRK Electronics First Alert 9120B6CP 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm - Contractor 6-Pack. Our Price: $62.88.