As mentioned in other reviews (which I read after originally purchasing the device) it *doesn't* support 100W charging on the first USB -Connect and charge something too, or via a second USB-C port. USB PD allows the device to adjust voltage and current. This device limits the voltage of the first port to 5V (up from 20V) when the second USB-C port is in use, effectively limiting the first port to 25W (USB-C maximum current is 5 amps) when both connections are used.
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