1. Universal mechanical metronome, suitable for most musical instruments, such as guitar, bass, piano, violin, drums, etc. 2. With precise rhythm and clear and loud sound, it helps to improve one's sense of beat and rhythm, and is suitable for musical instrument beginners. 3. Simple to operate. First, wind up the spring. Then, select the desired beat (2/3/4/6/0) and speed (40 - 208 beats per minute). Finally, open the protective cover and start the pendulum. One can adjust the speed by sliding the weight on the pendulum rod up and down according to the dial. 4. It is driven by mechanical energy and does not require batteries or additional power sources. It is powered by a winding mechanism to achieve beat counting. 5. It features a traditional pyramid - shaped design with a protective cover. The body is durable, with exquisite craftsmanship, and it is easy to carry and transport safely. 6. Dimensions: 20.1 x 11.7 x 9.2 cm 7. Material: ABS + metal 8. Color: green 9. Package contents: 1 metronome 10. Only the above - mentioned package contents are included, and no other products are included. 11. Note: Due to light reflection and different monitors, the color of the item in the picture may vary slightly from the actual one. The measurement error is allowed to be +/- 1 - 3 cm.