ammoon Portable Mini Mechanical Beat Tempo Metronome for Piano Guitar Violin Ukulele Chinese Zither Music Instrument Unique mini mechanical metronome design, only 11cm height, pocket size, very portable. The metronome adopts durable high-elastic nylon movement, which ensures a more stable working state, avoiding the shortcomings that ordinary metronomes are not accurate when once dropped. Its sound is soft, not harsh at all. Without bell ringing. It has a wind up mechanism and a swinging pendulum and is enclosed in a high-impact plastic case. Metronome can help you train your concept on music speed, make your instrumental performance more complete and smooth, and make the rhythm more even.