Universal mechanical metronome suitable for most musical instruments, such as guitar, bass, piano, violin, drum, etc. Accurate rhythm, clear and loud sound, helping you improve your sense of beat and tempo, suitable for musical instrument beginners. Easy to use, wind it up first, then select your desired beat(2/3/4/6/0) and tempo(40-208 bpm), finally remove the cover and set the pendulum in motion. You can slide up or down the weight on the pendulum rod to adjust the speed according to the meter plate. Eco-friendly mechanical energy, no battery or extra power is needed; adopts a winding mechanism for power to produce metrical . Traditional pyramid shape design with protection cover, durable body and exquisite workmanship, portable and safe to transport. size: 20.1 x 11.7 x 9.2cm Material: ABS+metal colour: green Package Contents: 1 x Metronome Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.