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For mobility, I have seen someone actually power a QY70 thru the DC port with a 5v USB power brick...though I personally would try to find something that could put out at least 10 volts DC so as to not stress the internal power regulator too much.

As for wall adapters, Yamaha brand is best of course is best, but an inexpensive one is not a big deal, it is always just hit or miss with quality ?on those. ?The big thick/heavy brick ones use a transformer and they tend to last but are unweieldy...while the smaller/lighter block ones are switching power supplies which are more efficient and smaller but somewhat more likely to fail over time (or be cheaply made). IMHO.
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? ? "The longest journey starts with the first step."?- Lao Tzu