D-Link AC750 User Manual page 10

Section 1 - Product Overview
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If you have attached one or more USB devices (such as a 2.5" USB drive) that draw a total of 0.7 A or more power, the power adapter will not supply enough voltage to
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charge your DIR-510L while simultaneously powering the USB devices.
The DIR-510L only supports charging other devices on USB port (1 A) in CHARGER mode.
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D-Link DIR-510L User Manual
...Power.Receptor.
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...(Micro.USB)
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...INTERNET.Port
Connect the included power adapter to power and charge the unit.
Connect an Ethernet cable to a cable or DSL modem to use Broadband Router Mode.
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