Unexpected emergency Notification: Fire alarm control panels will be the central hub for obtaining alerts from fire detection products for example smoke detectors and heat sensors. The SBBRKSM easichange® package replaces the discontinued BRK 660MBX optical and 670MBX ionisation smoke alarms and matches onto your present BRK twist-healthy alarm baseplate https://www.firesense.co.uk/type/addressable-fire-system/addressable-fire-alarm-control-panels/