Feature:This is the tremolo of the beloved classic tube amplifiers -- using the same photoelectric tube circuitry as the term in those amps of old.Intensity and Rate knobs make it easy to adjust the tone and vibe; using Rate Knob to adjust the effect speed, using the Intensity Knob to adjust the mixing ratio of delaying signal and original signal.With the True Bypass design, which minimizes tone loss, to realize the original sound of your guitar.LED visually indicates the working status of the guitar pedal; powered by DC 9V adapter, convenient to use. (Power adapter is not included.)Aluminum alloy casting with fine finish surface, stylish appearance; with standard 6.35mm input and output sockets, suit for most sound equipments and electric guitars.Specification:Model: JDF-9Input Impedance: 1m OhmsOutput Impedance: 1k OhmsRunning Current: 7mASpeed Range: 1Hz-25HzPower Supply: DC 9V Adapter (Not included)Item Size: 92 * 42* 52mmItem Weight: 138g / 4.9ozPackage Size: 10.5* 5.8 * 5.2cm / 4.1 * 2.3 * 2inchPackage Weight: 170g / 6ozPacking List:1 * Effect PedalNote:Power adapter is not included.