Mini Mechanical Metronome, Traditional Metronome, Portable Mechanical Metronome for Piano Player, Music Students, Musicians by Bravodeal Brand new, spring driven traditional metronome. Dimensions: 1.2" x 2"x 4.3" / 30 * 50 * 110(mm) Material: Hard plastic outer with high quality metal mechanism Specifications: 40-208 Bpm, Tolerance: &lt;= 1%; Package Included: 1 x Mini Metronome; 1 x Color Box; 1 x Instructions;