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Kidde KF20 Mains Standalone Interlinked Optical Smoke Alarm

Mains-powered smoke alarm that can be interlinked with up to 23 other Kidde mains alarms, optical or heat. 9V Alkaline back-up battery supplied as standard. Once interlinked, detection of the relevant danger by an individual unit will sound across all connected alarms. Can be used throughout the home, except in the kitchen where a heat alarm is recommended. Combined test/hush button allows regular alarm testing and can be used to temporarily silence nuisance alarms. Requires installation by a professionally qualified electrician. Fixings supplied. Interlinked when Hardwired Compliant with Standard 230V AC/DC Mains-Powered with Battery Backup 9V & AA Batteries Supplied 85dBA Alarm at 3m Test/Hush Button

Price: £23.99 from Screwfix

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