Check the listing for details. Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery Powered, LED Warning. Color: White, Condition: Open box. Listed at 34.99 USD. BrandKiddeStyle9th EditionPower SourceBattery PoweredColorWhiteProduct Dimensions1.88"D x 5"W x 5"HItem Weight10.43 ouncesAlarmSmoke and Carbon Monoxide DetectorOperating Humidity10 to 95% relative humidity (RH), non-condensingUpper Temperature Rating100 Degrees FahrenheitSensor TypePhotoelectric, ElectrochemicalAbout this item2-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.