Doorway alarm employs distant controls to set protection code for arming/disarming; house protection procedure full with thoroughly programmed primary device and sensors, afterwards if you need to Do-it-yourself, please factory reset initial according to guide, then pair them once more or look for Procedure movie on YouTube "KERUI Standalone Alarm https://www.firesense.co.uk/type/conventional-fire-system/conventional-fire-alarm-control-panels/