It uses the external USB power supply. It is a power 4G wireless router with 4G sim card slot It is a solution for enterprise, home, company, office's Wi-Fi networking. It's compatible with IEEE 802.11b/g standard, the data rate reaches to 100Mbps. It can support 5-8 Wi-Fi Users simultaneously. The frequency band is: FDD: B1 B3 B7 B8 B20, 3G: B1, Support Europe, Africa, part of Southeast Asia/Asia/South America. Type:USB Dongle Type:WiFi Router Type:Wireless Interface Type: USB Application: Laptop Application: Desktop For: desktop/laptop/cpmputer/any devices has wifi Plug and play: power bank/car charger/usb adapte colour:White Material:plastic Package Contents: 2 x usb dongle 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.