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First Alert AC Smoke Alarm with Lithium Battery Backup


IN STOCK! Ships same business day if ordered before 3pm PT

WARNING: Cancer and Reproductive Harm –

Product Description

The 9120 Series smoke alarms have been designed to install faster, perform better and be even smarter than before. These improvements help reduce nuisance alarms and save you time and money. It features a dual ionization smoke sensing chamber and a 10 year battery backup. The battery drawer is shipped pre-locked so that the battery will not be discarded prematurely, and it features a "Perfect Mount" system consisting of a gasketless base and a mounting bracket that keeps the alarm secure over a wide rotation range to allow for true alignment.

  • Single button test/silence
  • Latching alarm indicator: remembers which unit initiated an alarm
  • Smart Technology: helps reduce the number of nuisance alarms
  • Perfect Mount: allows for easy alignment of alarm
  • Dust Cover

Easy Installation/Maintenance:

Preferred features include a large opening in the mounting bracket for easy access to wiring. Keyhole slots in the mounting bracket eliminates the need to remove the electrical box screws for installation. Locking feature provided to prevent theft of the unit. Connection to AC power is made with a "Quick-Connect" wiring harness. Installation is quick, easy and cost effective.


First Alert Interconnect Alarms

This First Alert Alarm can be integrated into a mesh network with other First Alert Alarms using “Interconnect Technology”. First Alert Interconnect Alarms operate on a mesh network that integrates multiple wireless or wired alarms for better safety and response in an emergency. The mesh network of alarms re-routes and resends the signal via other First Alert alarms, providing a greater chance all alarms will receive the signal. Up to 18 total units can be interconnected, wireless or hardwired: with a maximum of 12 smoke alarms and 6 carbon monoxide alarms. Ordinarily, wireless and hardwired alarms cannot work together on the same interconnected network. However, with the hardwired bridge unit (model SA520B), hardwired and wireless models can be interconnected together on the same mesh network.


In The Box:

  • Smoke Detector
  • Dust Cover
  • Mounting Bracket
  • Installation Components

NOTES: Requires the 120VAC Smart Relay (sold separately) to activate an alert device.

Tech Specs

  • Part Number: 9120LBL
  • Audio Alarm: 85dB at 10 feet
  • Test/Silence:
    • Electronically simulates smoke condition, causing the unit to alarm
    • Press and hold test/silence button
  • Alarm Reset: Automatic when smoke clears
  • Interconnections:
    • Up to 18 units of First Alert or BRK Smoke, CO and Heat Alarms
    • Maximum of 12 smoke alarms
  • Smoke Sensor: Dual Ionization
  • Indicator Lights/Sounds:
    • AC Power: Constant Green LED
    • DC Power: Intermittent Red LED
    • Local Alarm: Red LED flashes rapidly
    • Remote Alarm: Red LED out
    • Latching Alarm: Green LED flashes 2 sec. on/2 sec. off after local alarm
  • Operating Voltage: 120V AC 60Hz w/ 9V lithium battery backup
  • Operating Current: 0.04 amps (standby/alarm)
  • Temperature Range: 40°F to 100°F (4°C to 38°C)
  • Humidity Range: 10% to 95% relative humidity (RH)
  • Dimensions: 5.6(Dia) x 2.0(H) inches
  • Weight: 7.8 oz
  • Listing: Listed to UL217 Standard
  • Warranty: 10-Year Limited

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