Pedal Features:        Full metal shell, durable and exquisite.      3 controlling knobs and 1 switch are accurate and high sensitive.      Level knob: Adjust the effects level or volume.      Speed knob: Adjust the speed of modulation.      Depth knob: Adjust the depth of effects.      Mode switch: Switch between 11 modulation effects of sine wave chorus, triangel wave chorus,positive flanger, negative flanger, jet flanger, vibatio, uni-vibe, vintage phaser, opto tremolo, bias tremolo and auto filter.      Output jack: 1/4'' mono audio jack for signal output.      Input jack: 1/4'' mono audio jack for connecting guitar.      True bypass footswitch and lever designed to prevent stamping on operation knobs.       Specifications:        Model: AROMA AMS-3      Effect: Ensemble      Material: Aluminium Alloy      Input Impedance: 470K Ohms      Output Impedance: 100 Ohms      Current Draw: 68 mA       Power supply: AC Adapter 9V DC (not included)      Item Size: 9 * 3.8 * 4.8cm / 3.5 * 1.5 * 1.8in      Item Weight: 151g / 5.3oz      Package Size: 12 * 7 * 6.5cm / 4.7 * 2.7 * 2.5in      Package Weight: 241g / 8.5oz         Note:      Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly.         Package List:      1 * Guitar Effect Pedal      2 * Adhesive Tape      1 * User Manual (English & Chinese)      1 * Hardcover Box