Professional Metronome Mechanical Movement Quick Adjustment Rust-proof Violin Guitar Universal Metronome For Beginner f54 With no batteries needed, the metronome adopts wind-up spring mechanism and its pendulum can deliver 40 to 200 beats per minute. Metal spring knob and fine workmanship makes the metronome rust-proof, comfortable to touch and not easy to break.Designed with loud mechanical sound and visual rhythm indicator, the metronome contributes to developing rhythm, maintaining tempo, playing music accurately and increasing your musical feeling. Meanwhile, it is also a great decor accessories for your instrument owing to the bright color, unique shape and charmingly elegant appearance.Made of high-quality ABS and metal, it is sturdy enough for your long-term use.The length of the product is 3.5cm, the width is 7cm and the height is 15cm.It is suitable for zither, piano, guitar, violin,drums and other instruments.Item Name: MetronomeMaterial: Metal,ABSColor: YellowFeatures: Rhythm Practice, Mechanical, AccurateSize Details: 15cm x 7cm x 3.5cm/5.91" x 2.76" x 1.38" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Metronome