Notice:The door sensor Window Sills only works with 2.4G wifi, not work with 5G. Befor you purchase the order please make sure is 2.4G wifi.How to connect WiFiIt is highly recommended to read here before connecting to a WiFi router. Before connect to wifi router, please check below points.1. Please make sure your wifi work at 2.4G mode, if your wifi support 2.4G & 5G double band, please disable 5G wifi at first, the door sensor will only identify 2.4G wifi. After the door sensor Window Sills connect to wifi router already, then you can enable 5G wifi for your router. The door sensor will keep connect to 2.4G wifi all the time.2. Please make sure your wifi router will not block the device MAC address Window Sills.3. Please make sure wifi signal strong. Advice put the door senor and your phone less than 2 meter distance from the wifi router during connect the device to wifi router Window Sills.How to Add the sensor:1. Download the Smartlife app or Tuya app.2. Log in to the app and press "+" in the upper right corner to add a sensor. No hub is required.3.turn on the bluetooth will be more easy add to the app.4. Ensure that the surface of doors and windows is smooth and clean.5.The installation distance should not exceed 0.7 inches.6.These two parts need to be aligned by their alignment notch.

Note:Shipping time is 5-12 days