FIRST ALERT BRK 9120LBL Hardwired Smoke Detector

carbon monoxide alarm,false alarms,up to 11 preprogrammed locations,features electrochemical Carbon Monoxide sensing technology,photoelectric smoke sensor

Separate smoke and CO detects both dangers and eliminates the need for two separate alarms,Electrochemical co sensor is the most accurate technology available,Latching alarm indicator remembers which unit initiated an alarm

Universal Security Instruments Hardwired Ionization Smoke and Fire Alarm with Battery Backup, Model 5304, up to twenty-four USI-compatible devices,Patentted Quick Find alarm origination easily identifies the first