Specifications:

Xiaomi Mi Door and Window Sensor 2 that senses whether a window/door is open or closed Product name Mi Door and Window Sensor 2 Product dimensions 34.0x32.7x14.5 mm Wireless connection Bluetooth 5.1 BLE Battery type CR2032 (installed) Operating temperature -10°C to 50°C Operating humidity 0%–95% RH, non-condensing Package contents Mi Door and Window Sensor 2 x1 Adhesive sticker x2 User manual and Warranty notice x1 - Delivery is n the same day if ordered before 6:30 pm