Features:  Smart sensor: wireless window/door sensor allows you to grasp window/door status in real time via mobile phone app.  Instant app notification: when the door/window is opened or closed, it will push notification to your smartphone immediately, to alert.  Intelligent home life: you can add it to you smart home system, use it with other devices, for better experience, safer home security.  Simple installation: small sensor, fast, effortless, easy, convenient to mount with adhesive pads, requires no wiring, no drilling.  Wide application: this smart window/door sensor is very suitable for home, garage, apartment, dorm room, office, shop, etc.    Specifications:  Material: ABS + electronic components  Color: white  Quiescent current: ≤10uA  Alarm current: ≤160mA  Low power undervoltage: ≤2.7V  Power supply: 2 * 1.5V LR03 battery (not included)  Magnetic control distance: ≥15mm  Working temperature: -10℃~50℃  Working humidity: max 95%RH  Item size: 7*2.5*2cm / 2.75*0.98*0.78in, 4.4*1.5*1.1cm / 1.73*0.59*0.43in  Package size: 7.5*5*2.5cm / 2.95*1.96*0.98in  Package weight: 40g / 1.41oz    Note:  Window/door sensor only, others in pictures are not included.  Due to manual measurement, there may be deviation.  Due to lights or others, it may slightly differ from pictures.    Packing List:  1 * Window/Door Sensor  2 * Adhesive Pad  1 * Pin  1 * User Manual