Weight:100gSize:90*43*13mmColor: as shownThe 130dB alarm will remind you and your family that someone has left or entered your house. Protect your home or office, whether you're at home or 250 meters from your home.Efficient and responsive: The door alarm system will be activated when the door opens more than 1cm. There are no false alarms, no messy alarms, no missed alarms.Low battery and low power consumption warning: The door sensor alarm can stand by for a year without the need to replace the batteries frequently. When the battery voltage is less than 2.1V, a beep will sound to remind the user to replace the batteries.Easy installation: no wiring requiredno screws neededeasy to mount on double-sided tape. Simply stick the 2 parts of the sensor alarm on 2 sides of the door and window frames, and there is no need to be completely flush with the door or window