Kidde Hardwired Carbon Monoxide Detector with 9-Volt Battery Backup, Digital LED Display 5.75 diameter x 1.8 depth

• Carbon monoxide alarm operates on a 120V wired power source with a 9-Volt alkaline battery (included) • Digital LED display shows the level of carbon monoxide the CO alarm is sensing • 85-decibel alarm announces when carbon monoxide is detected • Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested • Test-Hush Button makes testing the detector or silencing false alarms easy • Electrochemical sensor technology detects poisonous carbon monoxide gas inside your home • UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.