The magnetic wireless door sensor is convenient and practical, with excellent texture, and can serve you for a long time without being easily damaged. The craftsmanship can serve you well without breaking easily. This is a very practical magnetic wireless door sensor. Features -Color: White -Material: ABS -Size: 8.20X4.20X1.60cm/3.22X1.65X0.63in Note: random sign Battery type：2 x AA (not included) Stand by current：open:28.4uA close:28.1uA Trigger current：43mA Pairing current: 37mA Working time：4000 times Operating temperature：0 degree centigrade - 40 degree centigrade (32°F - 104°F) Operating Humidity：20% - 85% Storage Temperature：0 degree centigrade - 60 degree centigrade (32°F - 140°F) Storage Humidity：0% - 90% Wireless Type: 2.4GHz Protocol: 802. / Wifi distance: 45m - 2.4GHz WiFi one- , easy installation, no home gateway is needed, and can be easily achieve intelligent control of household appliances. - 2.4GHz protocol is stable, fast and convenient in use. - It will send push notification if or are opened or invaded by external object, and you will immediately know that there is an abnormality in your home. - Support smartphone remote control, easy to control door or window open remotely. - Powered by 2pcs AA batteries (not included), low power consumption and long battery life. Package list: 1 alarm