Features: Unique mechanical metronome design only 11cm height pocket size very portable. metronome adopts durable high-elastic nylon movement which ensures a more stable working state avoiding 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 speed make your instrumental performance more complete and smooth and make rhythm more even. Operating Instruction: (1)TO START: Wind up winding key in direction of arrow mark and push pendulum leftward. (2)TO SET TEMPO: Move sliding weight up and down and set its upper end on dial. (3)AFTER USING: Slide weight to middle or upper part of pendulum and put on cover. Specifications: Model: JX-V Color: White Black Red Mahogany Light mahogany (Optional) Material: and metal Suitability: For piano guitar violin ukulele Chinese zither and other instruments /per minute: 60~208/per 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