Korg GA Custom BK, Tuner, 3D Display, Accuracy: +/- 0.1 cent, 436 / 445 Hz, Vocal range: A0 (27.50 Hz) - C8 (4186 Hz), 3 Display modes, Operates with 2x AAA batteries, Power consumption: 40 mA, Dimensions: 99 x 65 x 16 mm, Weight: 83 g, Colour: Black