Specifications Clip-On Tuner Two Color Screen Backlight Chromatic, Bass, Guitar, Violin, Viola Wide Detection Range: A0(27.5Hz) - C8(4186.00Hz) Choose Internal Mic or Vibration Sensor Pitch Range: Reference Pitch From 430Hz - 450Hz (1Hz Steps) Swivel Mount Rotates For Easy Viewing Auto Power Save and Shut Off Extends Battery Life Detection Accuracy: +0.5Cent Power Supply: One 2032 Button Battery Dimensions: 71mm(L) x 38mm(W) x 60mm(H) Weight: 50g This Listing and Price is for 1 TT-1 GoGo Tuner