Dulcii Smart Home Magnetic Sensor Alarm Door Window Entry Warning Alarm 1 Alarm 1 Remote Controller Compact size and easy application, Low power consumption and long work time 4 buttons: alarm button, disarm button, emergent alarm button, doorbell button/learning code button Can be installed to doors and windows to prevent burglary via sending off alarm Kids' safe guarder, alarm will be triggered when it detects that the kid is going to open the window of the house Note: Please make sure that the magnetic stick stays on the right side of the magnetic sensor and the two aligns with each other, meanwhile, the distance between magnetic sensor and magnetic stick should be less than 10mm when the door is closed.