Real time monitoring of door/window opening and closing, immediate alarm push for abnormal changes, remote real-time switch status viewing via APP. Wide applications: Apply to bedroom, garage, bathroom, garden and other scenes, requires one Zigbee hub for linkage security. Battery powered with low power consumption, 1 year standby time; built-in 200mAh rechargeable battery, supports USB Type-C charging (2 hours charging duration). Home mode: Automatically turns on lights when opening the door at night. Easy installation with double-side tape, flexible to install on doors, windows, drawers, etc. ZigBee 3.0 (IEEE 802.15.4) wireless technology, plastic material, color: As shown in the picture. Package Contents: 1 x Sensor, 1 x Charging cable (other products not included). Note: Light reflection and different displays may cause slight color difference from the real item; measurement error is +/- 1-3cm.