The D'Addario Chromatic Pedal Tuner is the perfect combination of innovation, simplicity and style. Housed in a rugged aluminum enclosure, the tuner features fast note detection, superb accuracy, wide calibration range and true-bypass wiring with an easily accessible foot switch. The tuner's full-color vertical display allows for quick intuitive tuning at home, in the studio or onstage. Dimensions (W H D): 2.8 x 2.3 x 5.8 / 71.1 x 58.4 x 147.3 mm - Weight: 12.5 oz / 354.4 g D'Addario electronic tuners are designed by musicians for musicians featuring intuitive features, easy to read display's, and exceptional tuning accuracy. 32-bit processor for fast response featuring a slim, lightweight design True-bypass wiring with full-color vertical display Reference Pitch: A4 = 440 Hz / Calibration Range: 415 - 475 Hz Power Requirements: 9V Battery or 9VDC (300mA) Power Supply Current Draw: 27mA - 56mA / Tuner with no input signal: 40mA.