![]() It can get tricky, however, because not all USB hubs provide power to connected devices, and not all USB hubs enable data transfer. USB hubs are designed to do two things: transfer data between devices and charge devices when connected to a power source. Older cables transfer data at USB 2.0 speeds and newer ones transfer data at USB 3.0 speeds even though they have the same physical interface. For example, most Android phones use micro-USB-to-USB-A cables. USB speed standards are described with numbers, while USB interfaces are named with letters.
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