Model No. 865061 MT-50 Quartz Metronome Tempo Range: 40–208 Beats/Minute Tempo Selection: 39 Positions Beat Indication: 1 LED and Clicking Sound Indication Changeover: Light and Beat or Light only Accuracy IC: ± 0.05 % Reference Sound: A 440 Hz Terminal: Mini-Earphone Jack Battery: 1 x 9 V (6LR61 or S-006P) Earphone included Battery not included