Features: 1. Dust cover: keep clean, push down, open the front cover, push up, lock the cover. 2. Beat adjustment: The accent lever can adjust the beat type. 3. Metal scale: push the slider up and down to adjust the speed. Up to slow, down to fast. 4. The product is powerful and easy to operate for learn piano learning. Specification: Color: as shown Material: PC, iron plate, copper pieces Working principle: mechanical beat Size: about 210*115*115(mm)/8.27*4.53*4.53inch Mini model: 40*55*110(mm)/1.57*2.16*4.33inch Packing List: 1*metronome Note: 1. No instructions included. Make sure the items provided are suitable for your use before purchase. 2. Please allow a tolerance of 0.5-1 inch due to manual measurement. (1 inch = 2.54 cm) 3. We provide clear pictures and measurements as much as possible. Please check make sure the item is what you need. 4. Due to different computer screens, the actual color may be slightly different from that in the image.