What does this one do? This product is inserted into the USB slot of the computer host, supporting remote control by for Mijia APP and voice control by Xiaoxia. Is there any limitation on the control distance? There is no distance limitation. Anywhere, as long as the cell phone can access the Internet, you can control the remote switching machine, regardless of geographical restrictions. What are the requirements for the wireless router? The device supports 2.4GHZ band WIFI, does not support 5GHZ band WIFI, currently on the market to support 5GHZ wireless router generally also supports 2.4GHZ band, just need to turn on the 2.4GHZ band can be. Can I use the chassis button after installing this boot card? The old chassis buttons can be used, it does not affect. How is the switching control card connected to the Internet? The control card is connected to the Internet by connecting to WIF, when you use it for the first time, you can configure it once with the cell phone console APP. Do I need to install other software or drivers on the controlled computer? The computer does not need to install any software or drivers, there is no security risk. Colour:As Shown Material:Plastic Package Contents: 1 * Module 2 * Adapter Cables Only the above package content, other products are not included. Note: Light reflection 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.