SITERWELL 3-Pack Hardwired Interconnected Smoke & Carbon Monoxide Combo Alarm — 2-in-1 Smoke/CO Detector with Voice Alert, Self-Check, 2 AA Battery Backup, Interconnect up to 12 Units, 85 dB, 10-Year Sensor

Protect your home with this 3-pack of SITERWELL combination alarms that detect both smoke and carbon monoxide. Each unit can be hardwired or wirelessly linked with up to 12 other detectors so that when one alarm activates, all connected units sound to alert everyone. Power is provided by hardwiring with a 2 AA battery backup to keep the alarm functioning during power outages. Dual sensors deliver audible alerts exceeding 85 decibels, and a distinct voice message identifies whether the hazard is smoke or carbon monoxide. Built-in self-checking automatically monitors detector function and notifies you if a unit needs attention, removing the need for routine manual testing. The detectors use a high-performance chip and offer a 10 year sensor life, meeting UL 217 and UL 2034 standards for safety and reliability.