Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery Powered, LED Warning Light Indicators, 2 Pack 9th Edition 2 Pack

2-IN-1 DETECTION: Alerts you to both smoke & carbon monoxide (CO) using a single, cost-effective device.
NEVER-CHANGE 10-YEAR BATTERY: No low battery chirps or battery changes for 10 years & saves up to $40 over the life of the detector. (10-yr limited warranty on alarm, not a battery performance claim.)
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.
SELF-TESTING 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 85-decibel alarm will sound.
EASY INSTALLATION: No wiring needed, simply mount the bracket onto the ceiling and twist & click the 5-inch smoke & CO alarm into the bracket.
TEST & HUSH BUTTON: Makes it easy to test the 5-inch combination detector and silence false alarms, should they occur.
10-YEAR LIMITED WARRANTY: Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that alarms should be replaced.