Working voltage: 5V.; USB 2.0 chip, real high-speed chip.; (Hi-speed) USB 2.0 interface, the theoretical maximum rate can reach 480Mbps, and backward compatible with USB 1.1 / 1.0 standard specifications.; Equipped with four sets of USB sockets with hot swap function.; Current protection function, support overload voltage and instant current protection function, safe and convenient to use.