KIDDE 21032311 Hardwired Smoke & Carbon Monoxide Voice Alarm, Interconnectable with AA Battery Backup

The Hardwired Smoke & Carbon Monoxide Voice Alarm, Interconnectable with AA Battery Backup helps protect you and your family from two hazards - fire and potentially deadly CO - in one device. This smoke & carbon monoxide combo alarm features self-testing components that are always checking to make sure the alarm is on and working. Additionally, the included mounting bracket makes installation fast and easy. This smoke and CO alarm is capable of being hardwired to other select Kidde alarms, to provide whole-home alarm activation.