The new MM-2 is a personal metronome that fits on your ear, allowing you to play to a beat that only you can hear. Compact, personal metronome. 39 tempo steps in a 40-208 BPM range. Beat Values: 0, 2, 3, 4, 5, 6, 7 beats, 8th notes, triplets, 16th notes, +/-2% accuracy. Easy-to-adjust volume control. Piezoelectric speaker. Ear hook comfortably fits either ear. Ear pad reduces sound leakage, improves sound quality and stability. 2 interchangeable color caps. Includes 3V lithium battery