GE 98751 GE High-Speed USB 2.0 4-Port Hub - Manual (Page 6)

IV. Power Mode Setting
There are two power mode options for the USB 2.0 4-Port TetraHub™.
The first is bus-power mode, which does NOT require the use of an AC
power adapter. In this mode, the hub is provided with 500 milliamps for
all 4 ports. This should be adequate for mice, keyboards, and other low
power devices.
The second is self-power mode, which requires the use of an AC power
adapter. In this mode, each port is provided with 500 milliamps, allowing
for additional hubs, cameras and other high-powered devices.
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