Doorway alarm employs distant controls to set safety code for arming/disarming; property safety technique comprehensive with entirely programmed major device and sensors, later on if you wish to Do-it-yourself, you should manufacturing facility reset 1st As outlined by guide, then pair them once again or search Procedure online video on https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/