Features1Multi reminding methods (need to use with host + camera, not included). When an abnormality is detected, the door sensor alarm will send a signal to the host, and the host will alarm loudly, and automatically call/send alarm messages, and the scene can be checked through the camera. 2High-quality craftsmanship, the appearance of the use of anti-UV materials, to ensure that the sensor does not fade for a long time, for safer use, high-quality flame retardant materials are selected. 3The pocket door and window sensor has a mini body, does not take up space, it is perfectly integrated into your home environment, and will not affect the aesthetics of the home style. 4Toolfree installation, just stick and use. It will not be incompatible with the original home decoration. It can also be pasted to drawers, cabinets and letter boxes. Just tear off the protective film on the doublesided tape and paste it. 5Built-in 1pc CR2450 button battery, standby current 20uA, alarm current 50mA, low power consumption, long useable time, and long-term protection for your home safety. SpecificationItem Type: Door Magnetic SensorMaterial: ABSSupply Voltage: 3VPower Supply Mode: Button battery 1 x CR2450 (Include battery)Standby Current: 20uAAlarm Current: 50mAWireless Frequency: 433MHzWireless Distance: 100 meters/109yd (barrier-free) Package List4 xDoor Magnetic Sensor2 x Adhesive Tape