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The GM-1 is an ultra-compact metronome that you can place on one ear in the same way as with earphones. Use multiple GM-1 devices and everyone listens so they can practice with the same tempo & nbsp;in sync. This makes it possible to use the GM-1 for group practice such as marching bands or dance teams, and for rehearsals where you need to move around. The canal-type earpiece fits comfortably and securely in your ear, letting you clearly hear the metronome sound amidst the ambient sound.