You can't hear beyond 20k, but high res files go beyond that due to sampling rate. If it's compatable with sampling rate of 80khz or above, it meets that criteria which I have no doubt M0 does given all formats it supports.
Also consider your hearing range as well (it doesn't go up to 20k if old enough) considering your age.
That Hi Res is just marketing. It's meaningless.
Sure but my point is simply this...
Hi-Res Certification requires 40khz frequency in the amplifier/analogue side of the device.
The specs only state 20khz. Further reading on their website say 20hz-20khz (-0.5dB).
I'm not debating the merits of Hi-Res, just whether this thing is legitimately Hi-Res Certified. Chinese products have a tendency to award/certify themselves...