Battery: CR2 x 1 Standby time:2 years Standby current:13uA Wireless Type:2.4GHz Protocol: IEEE 802.11b/g/n Shell Material: Flame retarding VO class ABS+PC Controlling Distance: No distance limitation Operating Temperature:0℃～ 60℃ (32°F～104°F) Free app: Okos Smart Support systems: Android and IOS. Product Feature: Door magnet is a kind of security alarm device, which consists of wireless transmitter and permanent magnet. It is used to detect whether doors, windows, drawers and so on are illegally opened or moved. If the door and the door frame shift, the door magnet and magnet also produce displacement. The signal is transmitted immediately, and the alarm push is sent to the user. * Using 2.4 GHz Wi-Fi signal, the longest distance can reach 45M. * Free IOS and Android application. * After the movement is detected, the mobile phone can receive the push through APP. * Devices can be shared with others, and many people can modify the device and receive push. * Can be linked with other Wi-Fi product settings * Working hours can be set by linkage.