it uses the external USB supply. It is a 4G wireless router with 4G slotit is a solution for enterprise, home, company, office's Wi-Fi networking.It's the data rate reaches to 150Mbps.It can support 8 Wi-Fi Users simultaneously.The frequency band is: B1.B3.B7.B20.B38.B39.B40.B41Type:WiFi RouterType:WirelessInterface Type: USBApplication: LaptopApplication: DesktopFor: desktop/laptop/cpmputer/any devices has wifiColour:blackMaterial:plasticSize: 95 x 33 x 17mmPackage Contents:1 x usb dongleOnly 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.