Contains a WI-Safe Remote Warning Handset & a Wi-Safe Smoke Alarm, Handset will sound alarm & flash when smoke or carbon monoxide is detected by Fire Angels Wi-Safe Smoke or Carbon Monoxide Alarms, Removable handset automatically converts into escape torch with sound locator, Large central test/silence button makes weekly testing & silencing nuisance alarms easy, Ionisation sensor provides early warning of fast flaming fires that may spread rapidly & burn without producing thick smoke, Remote Warning Handset is mains powered with battery backup. Wi-Safe Smoke Alarm is battery powered, lasting up to 12 months.