120V Hardwire Alarm with a 10-year sealed battery back-up. Connection to AC power is made with a /Quick-connect/ wiring harness. It also features a dual ionization smoke sensing chamber screened for insect protection, an 85dB horn and a /silence/ feature. The /Smart Technology / system is designed to reduce nuisance alarms. Furthermore, the alarms are interconnectable with up to 18 devices, of which 12 can be smoke alarms.