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I thought that the $1 Chinese selfie clickers sent multiple key presses for one of those buttons. But I just checked and they seem to just send a single VolUp. They also send separate up and down, so on most devices they will do an auto repeat if you hold down the button.
The biggest disadvantage is that they timeout in 90 seconds (longer than the 60 seconds that I thought). This is plenty long to read a page, but not if you're a space cadet! Try it and see if this becomes an annoying factor for you.
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