Features: Unique 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 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. (1)TO START: Wind up the winding in the direction of the arrow mark and push the pendulum leftward. (3)AFTER USING: Slide the weight to the middle or upper part of the pendulum and put on the cover. Specifications: Model: JX-V Color: White, Black, Red, Mahogany, mahogany