With no batteries needed, the metronome adopts a wind-up spring mechanism and its pendulum can deliver 40 to 200 beats per minute. Metal spring knob and fine craftsmanship make the metronome rust-proof, comfortable to touch, and durable. Designed with a loud mechanical sound and visual rhythm indicator, the metronome helps develop rhythm, maintain tempo, play music accurately, and enhance musical feeling. Additionally, it serves as a decorative accessory for your instrument due to its bright color, unique shape, and elegant appearance. Made of high-quality ABS and metal, it is sturdy for long-term use. The product dimensions are 3.5 cm in length, 7 cm in width, and 15 cm in height. It is suitable for zither, piano, guitar, violin, drums, and other instruments. Item Name: Metronome Material: Metal, ABS Color: Yellow Features: Rhythm Practice, Mechanical, Accurate Size Details: 15 cm x 7 cm x 3.5 cm / 5.91" x 2.76" x 1.38" (Approx.) Note: Due to lighting and screen setting differences, the item's color may appear slightly different in pictures. Please allow slight dimensional differences due to manual measurement. Package Includes: 1 x Metronome