How is the power distributed amongst the four USB ports?

A total of 4-amps of power are provided to all four ports. This power is then drawn as needed by each device, without limit, per port.

For example, if you plug in three devices and they need 800mA, 1000mA and 1500mA, then each port will provide the adequate amount of power and 3300mA will be used with the remaining 700mA of power left for a fourth device.

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