Features: The Joyo JF-37 Analog Chorus pedal uses an BBD chip to give you the classic analog chorus sound and accurate reproduction. Analog Chorus can expand your musical horizon, when it comes to tones. Rate and Depth knobs let you adjust chorus speed and depth. True bypass design is used to minimise tone loss. Simple design and a sturdy casing. Specifications: Model: JF-37 Color: Blue Material: Aluminum alloy Input impedance: 1M Output impedance: 1K Running current: 12mA Power: 6F22 9V battery / DC 9V adapter (Neither included) Item size: 11.7 * 6.7 * 5.1cm / 4.6 * 2.6 * 2.0in Item weight: 200g / 7.0oz Package size: 13 * 7.5 * 6.2cm / 5.1 * 2.9 * 2.4in Package weight: 240g / 8.4oz Package List: 1 * Effect Pedal 1 * User Manual (English & Chinese) Note: This unit is without battery, put on the battery by opening the back cover with a screwdriver. Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly.