Notes: Please be clear before purchase, this product needs to be used with a zigbee3.0 gateway Before adding this device, you need to add a dream smart gateway 1. Connect the device to the power supply and that the mobile phone is connected to . 2. Open the app, click Add sub device under ZigBee intelligent gateway, and confirm device flashing mode. 3. For the on, press the reset key for more than 6S ith the pin, until the front indicator light flashes and the device indicator light flashes, then the distribution network mode can be entered. After the distribution network is successful, the distribution network indicator light flash three times and go out. Product name :Zigbee Door and Window Sensor Product model :-CG205 Networking form :ZigBee Detection : less than 5mm Powerinput :Cr2032 buton battery(1.5 years,10times per day) working temperature:-10C~45 Colour: white Material: ABS Size: 50mmx25mmx11mm Package Contents: 1 * Sensor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.