Features: Durable :this door handle is made from Polycarbonate, ensuring long lasting use. The door magnetic alarm perfect for home, shops, garages, supermarket, apartment, dorm room, home. For home burglar alarm system, important kits of home security. When door is opened by 2-3cm, the product immediately sends a signal to the host. The horn in the host will send out a loud alarm sound, so that the illegal can not start. NC type , normally closed : Switching offs when door is opened Specifications: Material:Polycarbonate Size:Approx.64x12.8x12.8mm/2.52x0.503x0.503" Working voltage: 100V Alarm current: 500mA Quiescent current: 100uA Working temperature: -10-50℃ Current: 0.5A Sensing distance: 15-25mm/20-30mm. Signal output: NC/COM with normally closed/normally open conversion. Connection mode: 250MM standard 1007 22AWG wire connection. Installation method: mounting type Action distance: 15-25mm Communication mode: wireds Package Includes: 1 Set Window Security Alarm Sensor note: Please allow 1-2cm errors due to manual measurement,Please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.