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The Ei100B is an Ionisation Smoke Alarm that runs on a 9V battery. Ionisation smoke alarms operate on the principle that electrical current flowing between electrodes in an ionisation chamber is reduced when smoke particles enter. The Ei100B is easily installed and comes supplied with all necessary screw fixings. The smoke detector will emit a beep every 40 seconds to indicate that the battery back up is depleted and needs replacing.