Portable WiFi does not need to be charged, directly inserted into the computer USB port on the line. In theory, if there is no computer, you can plug it into the charging bank, but the time should not be too long. Portable wifi is a device that can convert the wired, 2.5G, 3G, 4G network or Internet connection on the computer into wifi signals, which can meet the needs of business and tourism people who are dependent on the network for mobile work. Divided into sim card and usb computer for two. Use the wired network, the wireless chip (sim card) provided by the wireless carrier, or the computer's own Internet connection as the network source, on this basis to establish a wifi hotspot sharing network. Through this set of devices, the non-wifi access of the Internet connection can be extended to the wifi network for the Internet terminal use.