The LPCB-accepted fire alarm technique incorporates Fike’s Twinflex Multipoint ASD, combining smoke and warmth detection with the optional built-in sounder, allowing the complete program being set up applying only one pair of wires for each zone. The SBBRKSM easichange® kit replaces the discontinued BRK 660MBX optical and 670MBX ionisation smoke https://www.firesense.co.uk/type/addressable-fire-system/addressable-fire-alarm-control-panels/