One can also use an old school metronome and not lose much. They tend to be loud and are accurate when working well. Their main disadvantage is that they are generally slower to adjust to a newer tempo, especially if you are used to most digital metronomes. And having to wind (though that takes a while, and not a big problem). Using a mechanical metronome is better than having none to practice with for sure!
(I do not like app metronomes, though they may serve a purpose in a pinch.)
To show off one's technical prowess Mozart is a poor choice.
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