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The Aico Ei166RC Optical Smoke Alarm runs on 230V AC mains power, and has built in tamper proof Lithium cells that act as a battery back up in the event of mains failure. These rechargeable Lithium cells are designed to have a ten-year life and outlast the life of the smoke alarm itself, whilst providing up to six months of smoke alarm operation without mains power. The alarm gives a fire warning when adequate smoke enters the alarm. The alarm is supplied with an Easi-fit base that allows very quick and simple installation, combined with simple alarm removal and replacement. The Easi-fit base automatically connects both mains power and battery as the alarm slides on.