Smoke and carbon monoxide alarm Easy to install universal mount bracket Simple to use silent test button Separate smoke and CO latching alarm indicators Quick plug in power connector for easy installation Low battery warning chirp 9-volt battery backup for peace of mind during power outages 120 volts SPECIAL REQUIREMENTS FOR INTERCONNECTED SMOKE ALARMS Failure to meet any of the above requirements could damage the units and cause them to malfunction, removing your protection Length: 5.69Width: 2.25Height: 5.59