The Ei161RC is an Ionisation Smoke Alarm that 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 is supplied with the Easi-fit base that allows very quick and simple installation of the smoke alarm, combined with simple alarm head removal and replacement. The Easi-fit base automatically connects both mains power and battery as the detector slides on.