Features: Universal Mechanical Metronome: This universal mechanical metronome is suitable for most musical instruments, such as guitar, bass, piano, violin, drum, etc. Great Assistant for Musical Instrument Practice: Accurate rhythm, clear and loud sound, for 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 beats. Compact and Unique Design: Special bullet shape design, durable ABS body with a transparent protection cover, portable and safe to transport. Specifications: Color: Black Material: ABS + Metal Beats: 2/3/4/6/0 Tempo: 40-208 bpm Item Size: 9.5 * 11 * 20.1cm/ 3.7 * 4.3 * 7.9in Item Weight: 375g/ 13.2oz Package Size: 24 * 12 * 11cm/ 9.4 * 4.7 * 4.3in Package Weight: 490g/ 17.3oz Note: Please pull out the brake on the bottom before using the metronome. Package List: 1 * Metronome 1 * Users' Manual(English & Chinese)