The LPCB-accredited fire alarm method incorporates Fike’s Twinflex Multipoint ASD, combining smoke and warmth detection using an optional built-in sounder, letting your entire system being installed working with only one pair of wires per zone. The SBBRKSM easichange® kit replaces the discontinued BRK 660MBX optical and 670MBX ionisation smoke alarms https://www.firesense.co.uk/type/addressable-fire-system/addressable-fire-alarm-control-panels/