Kidde 10-Year Worry Free Hardwired Combination Ionization Smoke and Carbon Monoxide Detector with Voice Alarm

Kidde 10-Year Worry Free 120-Volt Hardwired-Interconnected Combination Smoke and Carbon Monoxide Alarm. The alarm is suitable as a single station and/or multiple station (24 devices) alarm. This alarm contains a 10-year sealed-in lithium battery backup. No batteries to replace in this hardwired alarm and a limited 10-year warranty.