Fangrui Product Details Metal Movement---all Pieces Of Movement Are Made Of Metal. This Can Long Time Use Without Error. It Is Very Important For A Beginner. It Can Help You Develop Rhythm, Maintain Tempo, Play Accurately And Increase Your Musical Awareness Adjustable Speed---the Adjustable Metronome Speed Is 60~208 , Meeting All Your Needs For Different Rhythm. The Pendulum Is Smooth And Tidy, With A Metal Panel, No Batteries, Has A Soft Sound. Mini Design---this Metronome Design, Only 11cm Height, Pocket Size, Very Portable. Designed With Simple Five-pointed Star Amplifier Hole, The Sound Is Clearer And Louder. With A Cover, The Small Size And Light Weight Make The Mini Metronome Very Carry And Store. Effective Practice Tool---suitable For Instruments, Including But Not Limited To Piano, Ukulele, Guitar, Etc. Our Product Can Be Used For Most Musical Instruments, Such As Piano, Guitar, Violin, Bass, Drums And Other Musical Instruments. It Helps To Master Rhythm Skills And Improve Your Beat And Sense Of Rhythm. Size: 11 X 3 X