Description: The working principle of door magnetic alarm When the distance between the alarm transmitter and the magnetic strip exceeds 20-30mm, the alarm immediately sends an alarm reminder to the mobile phone 1)Push instant notification to your phone immediately when door/window is opened or closed. so you don't have to worry about your baby going out of house without notice, will easily know when your aged parents leave or arrive home and even can be clear when someone enters your home,shop,office ,etc. 2)Provides 24-hour monitoring. Even you are far away from your home,garage and garden,etc, you can check whether the door/window is open or not with app anytime and anywhere. 3)Loud alarm will be triggered when someone open or close your door or window, make you informed all the time. 4)Support checking open / close records in app.Never worry about missing any important moment .If you install more than one door sensor in different places. All the statuses of doors and windows will be displayed simultaneously within the app ,so that you can easily know what you want at a glance. 5)The current of our wifi door detector is about 35uA, the smaller the working current, the longer the battery working time. 6)Share the added door sensors with your family member, they also can monitor the status of your doors/windows when you are outside. Specifications: Working Voltage:3V(2* AAA battery) Working Current:1959mA Standby Current:35uA Connect Method:: WIFI(802.11b/g/n) WiFi Distance:30M(No obstacles) Installation Distance:2CM Trigger Distance:23cm Working Temperature:-10~55 Easy installation 1. Install the main body to the bottom plate. 2. Tear off the 3M tape of the bottom plate and the magnetic strip, 3. Stick the main body and the magnetic strip to the selected position on the door] window and frame respectively 4. Scan the QR code of the product manual to download the APP device to prompt the operation. *In order to ensure the effect of installing the equipment, the distance between the main body and the magnetic stripe column should be no more than 10mm and away from the strong magnetic field. Package Included: door sensor*1