Know about portable wifi, used to be called wireless network card, it is easy to be confused with the network card on the motherboard, is a signal receiving u disk, the data goes to the u disk antenna into the output from the usb end, now most of the signals can be received with usb transmission can also be converted into wifi signal recommended Huawei, after all, it is expensive to use this kind of plug-in computer can be used, Inside the phone card card traffic this is the above plus a charging bank (? _?