Korg Pitchblack BK, chromatic floor pedal tuner with LED display, 100% true bypass output, four display modes (full strobe, half strobe, meter & mirror), compact pedal size, broad detection range from E0 to C8 (20,60Hz-4186Hz), adjustable calibration (436-445Hz), A 9V DC output jack is provided for cascading the power supply to other pedals, sleek, black and tough aluminium die-cast body for superb durability, DC IN (9V) and DC OUT (9V), 9V-Battery incl., 9 V power supply optional (# 108096)