Features:Large LED display, high sensitivity, with descending function (4 semitones can be lowered).Double display modes -- Normal display and Strobe display; press the FLAT/DISP to change the tuning mode display.Advance Tuning feature ,pitch A4 frequency range 435-445Hz. 4 steps flat tuning -- b, bb, bbb, bbbb.Made of high quality aluminum alloy, the pedal is durable and of a classic mini size.Rubber pads on the backside is anti-skid, which enhances the stability and avoids friction.Specifications:Type: TUNERColor: blackTuning Mode: chromaticTuning Range: A0(27.5)~C8(4186Hz)A4 Range: 435~445HzTuning Precision: ±1 centDetection Method: Audio Signal InputDisplay Mode: LEDTuning Method: AutoPower: DC 9V adapterItem Size: 9.2 * 4.1 * 3.4cm / 3.62 * 1.61 * 1.34inItem Weight: 166g / 5.85ozPackage Size: 10 * 6.5 * 6cm / 3.94 * 2.56 * 2.36inPackage Weight: 197g / 6.95ozPackage List:1 * mini pedal1 * user manual