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 10 Wi-Fi Users simultaneously.The frequency band is: FDD:B1/B3/B7/B8/B20, TDD:B40, 3G:B1/B8, European version, supports part of Asia and AfricaType:USB DongleType:WiFi RouterType:WirelessInterface Type: USBApplication: LaptopApplication: DesktopFor: desktop/laptop/cpmputer/any devices has wifiColour:whiteMaterial:plasticSize:96 x 33 x 12mm Package 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.