Feature: 1. 4 Function: Magnetic door sensor alarm contains 4 functions, general alarm mode, continuous alert mode, close door reminder mode and doorbell mode. 2. 108dB: When the door suddenly opens, this magnetic door and window alarm sensor will emit a high volume alarm of 108dB. Will prevent your child from sneaking out. 3. Low Power Grid Sensor: Magnetic door sensor alarm can be with fast installation speed, low power grid sensor, long battery life, avoid frequent replacement. 4. Low Probability of False Alarm: High performance, this wireless alarm is with low power consumption, long standby time, accurate alarm, low probability of false alarm. 5. Wide Use: Magnetic door alarm can be installed on front doors or window, garage doors, wine cabinets, front doors, safe deposit boxes, pet doors, filing cabinets, etc. Used to detect moves and opens. 6. ABS Material: Magnetic door sensor alarm is made of ABS material and great circuit chips with excellent workmanship. Specification: Item Type: Door Magnetic Sensor Alarm Material: ABS Battery: 1.5V AAA Battery x 2 (Shipped Without Battery) Alarm: 108dB Standby Time: 2 Years Operating Temperature: -10 - 60℃ Working Humidity: