Features: The Joyo JF-33 Analog Delay gives you mild and mellow circuit delay effect. 3 adjustable knobs: Time: adjust delay times; Repeat: adjust delay repeat times; Mix: adjust the contrast proportion. True bypass design to minimize the tone loss. Heavy duty switch with all metal casing.Specifications: Model: JF-33 Color: Green Material: Aluminum alloy Delay time range: 600MS-3000MS (millisecond) Input impedance: 1Mω Output impedance: 1Kω Running current: 40mA 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: 205g / 7.2oz Package size: 13 * 7.5 * 6.2cm / 5.1 * 2.9 * 2.4in Package weight: 245g / 8.6oz Package List: 1 * Effect Pedal 1 * User Manual (English !#!amp!*! Chinese) Note: This unit is without battery， put on the battery by opening the back cover with a screw driver.