First Alert BRK SC9120LBL Hardwired Smoke and Carbon Monoxide (CO) Detector with 10 Year Sealed Battery Backup

The brk SC9120LBL alarm features a dual ionization smoke sensing chamber and an electrochemical carbon monoxide sensor, an 85Db horn and a "silence" feature. This alarm features a 10 year battery backup. The battery drawer is shipped pre locked so battery will not be discarded prematurely. Under normal conditions you should not have to replace the battery for the life of the alarm. "Intelligent sensing technology" system is designed to reduce nuisance alarms. "Latching alarm indication" remembers which unit initiated an alarm. When interconnected in a series, the unit that triggered the alarm rapidly flashes its red LED indicator. After the alarm condition subsides, the initiating unit will store in memory or "latch" the information and begin to flash the LED indicator 2 seconds on, 2 seconds off. The "perfect mount" system features a gasketless base and a mounting bracket that keeps the alarm secure over a wide rotation range to allow for true alignment. Other contractor preferred features include a dust cover to keep alarm clean during construction, keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation. Two locking features are provided to prevent battery theft and/or theft of the unit. Connection to AC power is made with a "quick connect" Wiring harness. Installation is quick, easy and cost effective.Keep your family safer with this hardwired smoke and carbon monoxide alarm; The 10 year battery backup means constant monitoring for the life of the alarm even if there’s a power failure | Features an electrochemical Carbon Monoxide sensing technology as well as intelligent smoke sensing technology to reduce nuisance alarms; Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation | Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85 decibel siren provides a clear, loud warning upon detection | Simple to use, with a single test/silence button; Included 10 year lithium battery features a locked drawer to prevent tampering | 10-year limited warranty; Equipped with end-of-life signal chirp, so you know when it’s time to replace the unit for safety | Rigorously tested to meet UL standards, Emits T3 pattern | Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety | 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)