The USB 3.0 4-Port Mini Hub allows for up to four USB 3.0 devices to be connected simultaneously at a transmission speed of 5Gbps, while still providing connectivity and support for the older USB 2.0 (480Mb/s) and 1.1 (12Mb/s) devices. It works with high-bandwidth Super Speed USB 3.0 devices, such as webcams, flash drives, video surveillance cameras, digital video cameras, multi-channel audio and more. In addition, it supports fast charging for smart phone, tablets, and iPad.
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I love my iMac but with the USB ports being located on the back can be a pain. This little gadget simplifies that problem. Just plug it in one time to the back of computer and you have easy access to 4 USB ports. Can be used with or without AC power. Seems to be solid, quality build and with USB 3.0, you maintain the speed with your 3.0 devices. Very reasonable price I thought for a quality product.