Features:  Universal Mechanical Metronome: This universal mechanical metronome is suitable for most musical instruments, such as guitar, bass, piano, violin, drums, saxophone, etc.  Great Assistant for Musical Instrument Practice: Features high precision and accurate rhythm, clear and melodious sound, won't mix with the sound of musical instrument, the metronome is helpful for beginners to improve sense of beat and speed.  Easy to Use: Remove the cover and wind it up first, then select your desired beat(2/3/4/6/0) and speed(40-208 bpm), finally 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 Classic Design: Compact size, lightweight and easy to carry; classic pyramid shape design, durable ABS body, with exquisite workmanship.     Specifications:  Color: Silver/ Yellow/ Red/ Black;  Material: ABS + Metal;  Beats: 2/3/4/6/0;  Speed: 40-208 bpm;  Item Size: 11.6 * 11.6 * 25cm/ 4.6 * 4.6 * 9.8in;  Item Weight: 455g/ 16oz;  Package Size: 25.5 * 13.5 * 12.5cm/ 10 * 5.3 * 4.9in;  Package Weight: 575g/ 20.3oz.      Package Included:  1 * Metronome;  1 * Users' Manual.