Seiko SQ-70 Metronome, Quartz Metronome, Beats per minute / BPM: 40 - 208, Adjustable in 39 steps, Adjustable beat accentuation: 0,1,2,3,4,5,6, Tuning tone can be calibrated from a' 440 - 446 Hz, Built-in speaker and nine LEDs for pendulum simulation, Headphone output: 3.5 mm jack, Volume control, Colour: Black, Operable with 9V battery or with AC adapter (DC-9V) (both not included)