4.7 5 540
5 Overall Satisfaction Rating Great prices and a great check out experience, no idea why I haven't heard of your company.

First Alert PhotoElectric Smoke Alarm - Battery Backup

PhotoElectric Smoke Alarm - Battery Backup

Regular price $33.31 Sale

Shipping/Return Policy

: In stock

Basic photoelectric smoke alarm. Often used in hotels, dorms and other applications where an economical photoelectric alarm is required and tampering with batteries is a concern. Can be interconnected with up to 12 additional BRK and First Alert smoke alarms. Meets UL217


  • Photoelectric sensing chamber
  • Optipath 360 Technology
  • Single button test/ Silence feature
  • Two locking features- locks battery drawer and alarm to base
  • Alarm indication
  • 10 year limited warranty.

BRK 4120 Series to 9120 Series Cross Reference Chart

Old Model No. New Model No. Description
4120 9120 AC BRK Smoke
4120-12ST 9120-12ST AC BRK Smoke in 12-pack Stadium Tray
4120 9120 AC BRK Smoke
4120AB 9120AB AC/DC BRK Smoke w/Alkaline Battery
4120B 9120B AC/DC BRK Smoke (includes silence)
4120B-48B 9120B-48B AC/DC BRK Smoke 48 bulk pack
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 (available in 12pack)
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 Stadium Tray
4120SB2 Obsolete AC/DC BRK Smoke 2 pack-Retail
4120SB-48B Obsolete Not needed-Silence is a standard feature
41206CP 91206CP AC BRK Smoke Contractor bulk 6-pack
4120SB6CP 9120B6CP AC/DC BRK Smoke Contractor bulk 6-pack
4120SB-GFD Obsolete Not needed-Silence is a standard feature
4919A 9120A AC BRK Smoke Canada
8120BL Obsolete Not needed. Latching is a standard feature.
SA4120B-48B SA9120B-48B AC/DC First Alert Smoke 48 bulk pack
SA4120CN Obsolete AC First Alert Smoke-clamshell
SA4121B-48B Obsolete Not needed-Silence is a standard feature
SA4121CN SA9121CN AC/DC First Alert Smoke-clamshell 3-pack
SC6120B SC9120B AC/DC BRK Smoke/CO combo
None SC9120B-GFD AC/DC BRK Smoke/CO Gravity Feed Display
None SC9120BA AC/DC BRK Smoke/CO combo-Canada
SC6120B-12ST SC9120B-12ST AC/DC BRK Smoke/CO combo-12-pack stadium tray
SA4121CN3 Obsolete Replaced by SA9121CN

ELECTRICAL MARKETPLACE has been your #1 supplier for all things lighting and electrical since 2002. We have more than 30 years of combined experience providing Commercial LED Lighting Solutions for a wide range of applications including warehouses, offices, barns, gymnasiums, schools, and other commercial, residential, and industrial projects! Filter your searches by wattage, lumens, color temperature, and more! Our energy efficient lighting has saved our customers hundreds of thousands of dollars, and we want you to do the same! Take a look at this building materials manufacturer. Not only has it prevented the emission of 153 tons of gren house gasses anually, but its owners have saved $29,000 per year by switching to our lights! This fiberboard manufacturer has saved $242,000 per year by purchasing higher energy efficient lights. This isn't just a purchase - it's an investment! You can check out more of our past projects here.