Long-Life Ionization Smoke Alarm Pulsating 85-decibel alarm. Hush ® button silences false alarms caused by cooking, fireplaces or cigarettes; alarm resets automatically after seven minutes. Hush ® system override when dense smoke is detected. Includes flashing red power light, low-battery indicator, tamper-resistant locking pin & easy twist-off mounting bracket. Ten-year lithium battery included. Manufacturer's limited ten-year warranty.