The panel also displays The placement in the brought on system, making it a lot easier for emergency responders to quickly Track down and address The problem. The SBBRKSM easichange® package replaces the discontinued BRK 660MBX optical and 670MBX ionisation smoke alarms and matches onto your current BRK twist-match alarm https://www.firesense.co.uk/type/addressable-fire-system/addressable-fire-alarm-control-panels/