Harley Benton CPT-20 chromatic pedal tuner for electric guitar & bass, easy read LED/LCD display for fast tight tuning, true bypass, auto tuning range A (27. 5Hz) to C (4168Hz), precision:�1cent, on/off switch, jack input & output, DC POWER SUPPLY NOT INCLUDED , NOT TO USE WITH BATTERY, dimension: 95 x 46 x 49 mm, weight 112 gr.