The 770MBX smoke alarm is mains powered with 9V alkaline battery back up that will provide power to the unit in the event of a mains failure . Designed for use in the kitchen, garage or attic, up to 12 compatible smoke and heat alarms can be linked for simultaneous warning.;230V mains powered, mounting bracket included, push fit.;9V alkaline battery included;Test button;5 year guarantee
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