Wi-fi monitoring PowerG wi-fi technology back links into the intruder panel, alerting you and our monitoring centre of any challenges The SBBRKSM easichange® package replaces the discontinued BRK 660MBX optical and 670MBX ionisation smoke alarms and matches on to your existing BRK twist-in shape alarm baseplate so there's no need https://www.firesense.co.uk/type/addressable-fire-system/addressable-fire-alarm-control-panels/