Specifications: Mechanical movement, more precise beat. Metal knob and clockwork design, fan-shaped knob is easy to rotate. No need of battery, more energy saving and environmental protection. Item Name: Metronome Material: ABS + Plastic Steel Movement Speed: 40-208 Beats/min Features: Accurate, Mechanical, Easy to Use, Loud Sound Size: 198mm x 93mm x 117mm/7.80" x 3.66" x 4.61" (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