Item Type: Door/Window Sensor Material: ABS Color: White Size: Approx. 76x31x20mm / 3.0x1.2x0.8in Weight: Approx.51g/1.8oz Battery: 1 x CR2 lithium battery(Built-in) Battery Capacity: 850 mAh Application: Check the status of the door/window opening and closing in real time, and the on-off record is clear at a glance. Package List 1 x Door/Window Sensor 1 x Magnetic Strip 1 x Sticker 1 x Pin 1 x English Manual 1. Please allow 1& 8209;2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 1Trigger your alarm and get notified when a door or window is opened, very timely. 2Check the status of the door/window opening and closing in real time, and the onoff record is clear at a glance. 3Independent use, without host/gateway, simplifying complexity. Exquisite and stylish appearance, fit for various environments. 4Ultralow power consumption and long battery life, energysaving and more practical. 5Completely wireless with user-replaceable battery. The product has the door opening, closing, battery power display.