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: TUNER Color: black Tuning Mode: chromatic Tuning Range: A0(27.5)~C8(4186Hz) A4 Range: 435~445Hz Tuning Precision: 1 cent Detection Method: Audio Signal Input Display Mode: LED Tuning Method: Auto Power: DC 9V adapter Item Size: 9.2 * 4.1 * 3.4cm / 3.62 * 1.61 * 1.34in Item Weight: 166g / 5.85oz Package Size: 10 * 6.5 * 6cm / 3.94 * 2.56 * 2.36in Package Weight: 197g / 6.95oz Package List: 1 * mini pedal 1 * user manual