Features 1、4 controlling knobs are accurate and high sensitive. 2、Level knob: Adjust the effects level or volume. 3、Speed knob: Adjust the speed of modulation. Specification 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 Package List 1 * Guitar Effect Pedal 2 * Adhesive Tape 1 * User Manual (English & Chinese) 1 * Hardcover Box