Features 1、A re-creation of the classic Ross compressor, with very low noise. 2、Use the Sustain, Attack, and Level knobs to find your ideal tone. 3、Sustain, Attack, Level knobs. 4、True bypass design minimizes tone loss. 5、Aluminum alloy casing with stove varnish finish. 6、Use the Sustain, Attack, and Level knobs to find your ideal tone. Sustain: To control the delaying time of compressing; Attack: To control the starting time of compressing effect; Level: To control the output level. 7、True bypass design to minimize the tone loss and provide transparent tone. 8、Aluminum alloy casing with stove varnish finish, stable and strong. 9、LED indicates working and power statement. Powered by a 6F22 9V battery or 9V DC power adapter (neither included). 10、LED indicates working and power statement. 11、True bypass design minimizes tone loss. Powered by a 6F22 9V battery or 9V DC power adapter (neither included). 12、Sustain: To control the delaying time of compressing; Attack: To control the starting time of compressing effect; Level: To control the output level. 13、True bypass design minimizes tone loss. Aluminum alloy casing with stove varnish finish. Specifications: Features: A re-creation of the classic Ross compressor, with very low noise. Use the Sustain, Attack, and Level knobs to find your ideal tone. Sustain: To control the delaying time of compressing; Attack: To control the starting time of compressing effect; Level: To control the output level. True bypass design minimizes tone loss. Aluminum alloy casing with stove varnish finish. LED indicates working and power statement. Powered by a 6F22 9V battery or 9V DC power adapter (neither included). Specifications: Color: Green Material: Aluminum alloy Input impedance: 500K ohm Output impedance: 10K ohm Running current: 8mA Power: 6F22 9V battery / DC 9V adapter (Neither included) Effect pedal size: 11.8 * 6.4 * 3.8cm / 4.6 * 2.5 * 1.5in Effect pedal weight: 302g / 10.7oz Package size: 13 * 7.7 * 6cm / 5.1 * 3.0 * 2.4in Package weight: 349g / 12.3oz Package list: 1 * Effect Pedal 1 * User Manual(English & Chinese) Note: No battery or adapter is included. 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(English & Chinese) Note: No battery or adapter is included. Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly.