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2IN1 DETECTION Alerts you to both smoke carbon monoxide CO using a single detector ENHANCED SENSING TECHNOLOGY Reduces false smoke alarms often caused by cooking Comprehensively tested to meet the latest UL standards meets UL 217 9th Edition UL 2034 4th Edition FCC standards NO WIRING NEEDED Operates on 2AA alkaline batteries included providing easy installation simply mount the bracket onto the ceiling and twist click the 5inch smoke CO alarm into the bracket SELFTESTING ALARM Internal components ensure alarm is always operating as expected Not a substitute for a manual push test perform a button test once per week to verify alarm operation 3 LED NOTIFICATIONS LED lights indicate alarm status green normal operation amber operating error red smoke or carbon monoxide detected a loud 85decibel alarm will sound TEST HUSH BUTTON Makes it easy to test the 5inch combination detector and silence false alarms should they occur BATTERY REPLACEMENT Batteries should be replaced every 6 months a low battery chirp alerts you when batteries need replacing 10YEAR LIMITED WARRANTY Warranty begins when the alarm is powered on If that date is unknown it should be assumed that alarms should be replaced