Versatile Design: This metronome is compatible a wide range of instruments including piano, guitar, guzheng, violin, bass, and erhu, making it an ideal choice for musicians practicing different instrumentsMaterial: Mechanical metronome with a full metal pure copper movement, ensures stable and reliable rhythm accuracy for consistent practice sessionsAdjustable Speed Range: With support for speed adjustments from 10 to 208 per minute, this metronome caters to the needs of both beginners and professional musicians across various practice levelsEasy to Use: Professional metronome adopts metal knob, which is not easy to break and rust, and the speed adjustment by sliding the slider is and stable in performancePortable: The Universal metronome is lightweight, easy to carry and use, and can be carried to the performance site, music class, practice room, etc Size Chart: 20x9.3x11.7cm/7.87inchx3.66inchx4.61inch Package Includes: 1Mechanical Metronome Note: Please allow slightly errors due to manual measurement and different monitors.