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A few short dubstep-y noises, a waveform visualizer, and not much else. Annoy your friends and enemies alike. scare someone with it's monstrous wobble. Stare at the pretty colors.

It requires permission to record audio (calls it the microphone) so it can display the visualization. You can deny that and still make noises with it, but nothing is ever actually recorded. No network permissions, so it couldn't send them anywhere even if it wanted to.