Optical smoke alarms, also called photoelectric smoke alarms, 'see' smoke. They have a quick response to visibly smouldering fires (e.g. from foam filled furniture & overheated PVC wiring). They are also particularly good in areas where you can otherwise expect false alarms (e.g. near kitchens). We recommend the use of optical smoke detectors in living rooms, bedrooms and hallways.
The Firehawk FH250BB is a mains powered optical smoke alarm with an alkaline battery backup. It can be hardwired interlink up to 15 devices in one system including the Firehawk FH250 or FH450 alarms.