Features: A representation of the classic Tube Screamer, with an updated JRC4588 chip. The overdrive effect is mellow, mild, smooth and exquisite. True bypass design to minimize the tone loss. Drive, Tone, and Volume Controls: Drive: adjust the degree of distortion; Tone: adjust the intensity of the tone; Volume: adjust the volume of the sound. Aluminum alloy casing with stove varnish finish. Powered by a 6FF22 9V battery or 9V DC power adapter (Both are not included). Specifications: Color: Green Effect pedal size: 11.8 * 6.4 * 3.8cm / 4.6 * 2.5 * 1.5in Effect pedal weight: 300g / 10.6oz Package size: 13 * 7.7 * 6cm / 5.1 * 3.0 * 2.4in Package weight: 332g / 11.7oz 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 * Effect Pedal 1 * User Manual