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. Operating Instruction: (1)TO START: Wind up the winding key in the direction of the arrow mark and push the pendulum leftward. (2)TO SET TEMPO: Move the sliding weight up and down and set its upper end on the dial. (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 (Optional) Material: and metal Suitability: For piano, guitar, violin, ukulele, Chinese zither and other music instruments /per minute: 60~208per minute Item Size: 5 * 3.1 * 11cm / 2 * 1.2 * 4.3in Item Weight: 154g / 5.4oz Package Size: 6 * 4 * 11.8cm / 2.4 * 1.6 * 4.6in Package Weight: 175g / 6.2oz Package List: 1 * Mechanical Metronome