Mains-powered optical smoke alarm that can be interlinked with up to 23 other 240V mains Q2300 / Q2300LL alarms. Once interlinked, the detection of the relevant danger by an individual until will sound across all the conntected alarms. Photoelectric alarms are for use in escape or circulation routes and in areas where there is a danger of ignition of furniture and surroundings by cigarettes producing slow, smouldering fires. This mains-powered unit should be installed by a qualified electrician. The alarm comply with AS3786:2014 standards.