Features: Play your favorite pieces with ease,this mechanical metronome helps you develop rhythm, maintain tempo, play accurately and increase your musical awareness. Applicable for most music instruments—produce rhythms at a proper pace when practicing piano, violin, guitar, bass, drum and other musical instruments. Accurta and durable,the movement is made of high-hardness plastic and metal， with precise rhythm and stable performance, and more durable Incredible features,audible click & bell-ring to maintain the rhythm while reading music sheet; wind up mechanism produce metrical-beats, no battery required; tempo range: 40-200bpm. Wonderful gift,sweet warm gift for friend family or yourself. Specifications: Material:ABS+Metal Package Includes: 1Piece Mechanical Metronome note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the picture may not reflect the actual color of the item.