parameter: Operating voltage: 3V (2 AAA alkaline batteries) Quiescent current: 2 (uA) Operating current: 35mA Alarm current: 15 (mA) Emission frequency: 433.92 (MHZ) Wi-Fi：IEEE 802 11 b 2.4GHz Working environment: -10C-50C (14F-122F) Single weight: 38.5g Size: 1.2x0.7x2.8" Packing list: Door magnetic alarm x1, double-sided glue x1, English instruction manual x1, card needle x1 Door magnetic status synchronization: no longer worry about whether to go out or not to forget to close the window, through the graffiti app interface to easily view the status of the door and window switch, so that you can travel worry-free Remote reception alarm: When the door and window are illegally opened, the door magnet will send out an alarm signal in real time. At the same time, users can remotely receive alarm information alerts via mobile phone Low power tip: Door magnet needs to use 2 AAA alkaline batteries, when the battery is low, through the app push information prompts the user to replace the battery in time App real-time viewing: Mobile APP will record the status of each door magnetic switch for you, anytime, anywhere to view the record. Keep you and your family safe 24 hours a day, and record every detail Easy installation: 3M glue installation, strong and durable. No need to install with complicated tools, two shears can be installed opposite each other