Features: 1.LARGE SPEED ADJUSTMENT AND DEPTH ADJUSTMENT RANGE: Come with classic photoelectric vibrato sound, has a large range of speed adjustment and depth adjustment 2.ADJUST VARIOUS EFFECTS: BIAS knob can adjust various vibrato effects, which will meet your different needs, versatile and practical 3.TRUE BYPASS: Tremolo effect pedal adopt full metal casing. The appearance is small and exquisite. True pass through design 4.EXCELLENT IMPEDANCE PERFORMANCE: Input impedance is 1M Ohms, output impedance is 1k Ohms, this effect pedal has excellent performance 5.GOOD METAL MATERIAL: Metal tremolo effect pedal use excellent metal material, wear resisting, shiny, sturdy and durable specification:Item Type: Tremolo Effect Pedal Material: Metal Colour: Black Input: 1/4in Mono audio jack (1M Ohms impedance) Output: 1/4in Mono audio jack (1k Ohms impedance) Power Supply: 9V DC transformer (inside negative and outside positive) Working Current: 5 mA PackageList: 1 x Effects 1 x User Manual 1 x Sticker