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4 port USB hub with built in 12m active extension cable can be used to extend the cable length of up to 4 USB 2.0 devices. The extension acts as a transparent hub and buffers all upstream and downstream traffic. Specification: USB 2.0 active extension with 4 Port USB Hub Type A Male to 4 x Type A Female Cable length 12 meters Gold Flashed contacts Supports Windows 8 7 XP and Mac OS