Door alarm uses remote controls to set security code for arming/disarming; home security system complete with fully programmed main unit and sensors, later if you want to DIY, please factory reset first according to manual, then pair them again or search operation video on YouTube "KERUI Standalone Alarm System Operation Guide" for reference. DIY expandable home burglar security alarm system - This alarm horn supports up to 40 pcs wireless detectors, 10 remote controls, 10 doorbell buttons, up to 115dB loud alerts with deluxe door alarm system for peace of mind. Complete DIY wireless house burglar alarm system kits includes a horn and two door/window sensors, two remote controls, a PIR motion detector, loud alarm and better protection for apartment shed hotel garage safety, affordable home security. SOS alarm to get help - Children and seniors at home when in emergency, they can press the [S] button of the remote control, which will set off the siren alarm up to 115dB to notify other members at home or neighborhood, so that they can get help in time. After-sale service - Kindly refer to the user manual before use, if you have any questions or needs to customize alarm system kit, please feel free to contact us, we will try our best to help; The alarm system kit can work with KERUI brand alarm hub, DIY the alarm system as you require., Weight: 1.4109584768 Pounds, Manufacturer: KERUI