Alerts you when increased levels of carbon monoxide, a dangerous and odorless gas, is detected in your home. 120V AC wired carbon monoxide alarm. 9V battery backup. Interconnectable with other Kidde alarms. The Kidde Carbon Monoxide Alarm alerts you to increased carbon monoxide (CO) levels in your home. This unit may be used alone or as part of an interconnected alarm system in your home, without requiring any rewiring. Interconnected systems provide an earlier warning because they link together - when one alarm sounds, they all sound. This provides more warning in more places, and gives individuals more time to escape. This alarm may be interconnected with up to 24 Kidde-brand devices, including smoke and heat alarms. It is a hard wired unit with a quick-connect wire harness for fast installation, and uses a 9V battery backup for continuous protection in case of power failure. Features: 120V AC wire-in Smart interconnectability with up to 24 devices. 85 decibel Alarm at 10 feet. Red LED light flashes in conjunction with alarm beep. Green LED light flashes to indicate unit is on 9V DC battery backup. Amber LED light indicates unit is initiating the alarm. Tamper Resistance tabs help deter tampering or theft of unit or battery. Test/Reset button. Adjustable mounting bracket allows for fast installation and perfect alignment. UL listed. Feature Details Brand Kidde Mfg part # 900-0120 UPC 047871001200 Warranty Ten year limited warranty Color White Weight (lbs) 0.9 Battery operated? Yes (batteries optional) Batteries included? No Battery details (1) 9V Alkaline Country of Manufacture China System (no system / stand-alone) Alert Type(s) Vibration Flashing Light Loud Audible Low Vision / Deaf-Blind No No Yes No Transmitter / Receiver Transmitter Alert Trigger(s) Baby Cry Carbon Monoxide Mobile / Smartphone Doorbell / door knock Motion Pager / SOS Phone / VP Smoke / Fire Sound Severe Weather No Yes No No No No No No No No Expandable Yes Portable No Battery backup Yes USB charger No