Features: Acoustic guitar simulation effect pedal. Supports 3 modes: Piezo, Standard, Jumbo. With volume, resonance of guitar body, overall brilliance and harmonics adjusting knobs. True bypass footswitch for switching effects and bypass. LED light for indicating working status. Full metal shell, durable and sturdy. Effects Explanation: Piezo--Simulates sound from a piezo pickup installed on an electric-acoustic guitar; Standard--Simulates a normal acoustic guitar sound; Jumbo--Simulates a bigger body acoustic guitar with more low end and resonance. Specifications: Material: Metal Working Modes: Piezo/ Standard/ Jumbo Signal Input: 1/4″Monaural Jack (impedance: 1M Ohms) Signal Output: 1/4″Monaural Jack (impedance: 100 Ohms) Supply: 9V adapter (center minus plug) Working Current: 17mA Item Size: 3.5 * 9 * 3cm / 1.4 * 3.5 * 1.2in Item Weight: 152g / 5.4oz Note: adapter is not included. Please use adapter whose polarity is positive pole outside and negative pole inside. Otherwise, product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual(English & Chinese) Acoustic guitar simulation effect pedal. Supports 3 modes: Piezo, Standard, Jumbo. With , resonance of guitar body, overall brilliance and harmonics adjusting knobs. True bypass footswitch for switching effects and bypass. LED light for indicating the working status.