Effect pedal. Sound based on vintage studio rack-mount compressor equipment. Carefully selected transistors for reaching the HI-END compression sound. 100% Analog signal path. True Bypass footswitch for crystal-clear tone. Aluminum-alloy Die Cast case to withstand wear and tear. Heavy duty metal footswitch and on/off status LED. 4 Easy-to-read,readily accessible knobs. Wide range SUSTAIN Control. TONE knob can adjust the brightness. ATTACK knob for creating hard punchy tone. Dimensions 93 mm (D) x 50 mm (W) x 46.5 mm (H). Weight: 175 g.