Features: 1. Dust cover: keep it clean, push down to open the front cover, push up to lock the cover. 2. Beat adjustment: The accent lever can adjust the beat type, and the clockwise winds the metronome. 3. Metal scale: push the slider up and down to adjust the speed up to slow, and down to fast. 4. Powerful function, convenient operation, recommended for learning piano. Specifications: Color: as shown in the pictures Material: PC, iron plate, copper parts Working principle: mechanical beat Mini type: about 40*55*110mm/1.57*2.17*4.33in Packing List: 1 x Metronome Notes: 1. No instructions are included. Please make sure that the items provided are suitable for your purpose before buying. 2. Due to manual measurement, please allow 0.5-1 inch tolerance. (1 inch = 2.54 cm) 3. We provide clear pictures and measurements as much as possible. Please check this picture as much as possible to make sure that the item is what you need. 4. Due to some factor like computer screens, the color of the actual product may be slightly different from that shown in the picture.