WIND UP METRONOMES --No battery needed, it uses a winding-up mechanism to operate. Easy to use: wind it up, adjust beat and tempo. Tighten the spring, select the desired rhythm and set the pendulum in motion, then you get ready to use it. AUDIBLE CLICK BELL RING --Metronome has a clear, loud sound when playing instruments. Audible click and bell ring can maintain the rhythm and tempo while reading music sheet, then playing more accurately and increase musical awareness. TRADITIIONAL ELEGENT PYRAMID DESIGN --Metronome is designed with a traditional pyramid shape, classic and elegant. So it can keep low gravity center, stand steadily on horizontal surface, not leaning and keep working better. APPLICABLE FOR MOST MUSIC INSTRUMENTS --The metronome can be used for most musical instruments, such as piano, violin, guitar, drums, bass, mandolin and other wind instruments. Help you to practice and keep a proper pace when playing instruments. Product Quantity: 1 Piece Product color: black Product size: 93*117*198mm