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Just a reminder from the product information on these:
*Please note that this passthrough does not contain a internal battery and requires at least 2 amps from the USB power source. We recommend using a Powered USB Hub or a 2 Amp USB Wall/AC Adapter to avoid possible damage to your PC's USB ports.
*A compatible 2 Amp USB Wall/AC adapter for this Passthrough will be available for purchase in about 2 weeks.
Anyhow, best of luck to you!
That is exactly why I want one, so I can save my batteries for the rest of the time.
Happy Monday!