OOTD full analog circuit and aluminum alloy housing. Sustain: adjust the compression ratio. Attack: Set the attack time of the compression effect. Level: control the signal level. True bypass design minimizes loss of tone. Specification: Input Impedance: 1M ohm Output Impedance: 10K ohm Power Supply: AC 9V DC adapter minimum 300mA (not included)Product Size: 9.4 x 5.1 x 5.3cm / 3.7 x 2 x2.1in Product Weight: 177g / 6.2ozPackage Included: 1 x Small Pedal. Note: AC powered adapter (not included)Please allow 0-1cm error due to manual measurement. Make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!