Doorway alarm uses distant controls to set protection code for arming/disarming; dwelling stability system total with completely programmed primary unit and sensors, later if you'd like to Do-it-yourself, please manufacturing unit reset initial according to guide, then pair them all over again or research operation video on YouTube "KERUI Standalone https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/