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 exquisite 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 Battery type2 x AA (not included) Stand by currentopen:28.4uA close:28.1uA Trigger current43mA Pairing current: 37mA Working time4000 times Operating temperature0 - 40 (32F - 104F) Operating Humidity20% - 85% Storage Temperature0 - 60 (32F - 140F) Storage Humidity0% - 90% Wireless Type: 2.4GHz Protocol: 802.11b/g/n Wifi distance: 45m - 2.4GHz WiFi one-key connection, 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 the doors or windows 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.