I'm not entirely sure I understand. Wireless presenters have 2 components - receiver (with buttons) and transmitter. Receiver is usually powered by a battery. Transmitter is powered via a USB connection, so it is feeding off of a device itself.
But, of course I will test it out with an ereader. I preordered Illumina XL, so when that arrives in December I will post an update. So far, though, it works wonderfully on my phone.
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