The Door Sensor with arm/disarm button and a set button. Excellent design, tiny, and fashionable. Easily install with adhesive tape. Contains a 1pcs wireless RF 433HMz door sensor Wireless 433HMz standalone door sensor can work alone as a door/window open reminder. Once triggered, it will send out a 120db warning to scare away the thief It also can work as an alarm host connecting with 433HMz wireless detectors(such as fire sensor and PIR sensor), remote controls, and emergency buttons, etc. Simply attach one piece to your door, window, or cabinet door, and attach the other piece to the door or window frame Ideal intrusion warning for homes, apartments, dorms, offices, hotel rooms, warehouse, garages, shops, counter, Internet bar, etc. Specifications: Installation: magnetic control Wireless Frequency: 433MHz Working Voltage: 3V Standby Current: 10mA Working Current: 80mA Door Sensor Battery: 2*LR03 AAA AM4 1.5V (not included) Two status: open and close Action Distance: 10mm Alarm Sound: up to 120dB Material: ABS, common white Operating environment: -10-60 (14-122) Humidity Range: 90% RH (No freezing) Door Sensor Size: Main body (D*W*H): 98*45*19mm Deputy body (D*W*H): 46*13*18mm Package included: 1 x Door Sensor 1 x Set of Adhesive Tape 1 x English and Chinese User Manual