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1.USB3.0 chip , high-speed chip . 2. (Hi-speed) USB3.0 interface, theoretically high speed up to 5Gbps, and backward compatible with USB 3.0/2.0/1.1/1.0 standard specifications 3. Equipped with four sets of USB sockets with hot plug function 4. Current protection Function , support overload voltage and current protection function, easy to use 5. Working indicator light 6. Working humidity : 10%-90% 7. Working voltage : 5V 8. Working current : 500mA 7. Working temperature : -20C-75C 8 . storage temperature : - 85C -40C 9. : support system Windows 95/98/2000/2003 / ME / XP / Vista or Mac OS 8.1 above (Windows 95/98 need to install the driver in the system ) Colors are optional, classic design, exquisite shell, hot-swappable, low power consumption. Product is suitable for U disk, card reader, USB mouse, USB keyboard, scanner, digital camera, digital camera, USB sound card, hard disk boxes and other equipment, extension 4 Ge USB interfaces, each supply up to 500Ma , with the second generation USB HUB controller, no driver, plug and play, and more support 127 Ge USB devices, all using electronic devices to ensure stable product.