First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 5 Pack

Protected in Every Way - This combination smoke and carbon monoxide alarm will alert you to both smoke and carbon monoxide, two deadly household hazards. Tired of Too Many False Alarms? - Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provide early warning in the event of a home fire emergency. Stay Safe Even With a Power Failure - If your power goes out, this smoke detector will continue functioning with its 9V battery backup. Ring One, Ring All - In the event of a safety threat, all connected alarms will sound to help provide an early warning to your entire household. A visual indicator on the smoke alarm identifies the unit that initiated the alarm. This fire alarm can connect with up to 12 other compatible detectors and six other compatible devices. End-of-life Warning - To ensure your ongoing safety and peace of mind, this wired smoke detector will alert you when it is time to replace the alarm