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The ST4300PBU3 is a bus-powered USB hub so the amperage will depend on the USB port on the host computer. USB 3.0 can provide 5V at up to 0.9A so if the hub is connected to a USB 3.0 port on your computer, it will share the 0.9A with all 4 ports. If connected to a USB 2.0 port, it can provide up to 0.5A which will be shared among the 4 ports. Brandon, StarTech.com Support
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