1. With precise , ATTACK, RELEASE, control via 3 knobs. 2. signal Input/Output control. With gain reduction indicator. 3. Toggle SYNC: All the LED from both sides and the top are controlled by the foot switch. 4. Toggle ALWAYS: The LED on both sides are on and not controlled by the foot switch, while the LED from the top is controlled by the foot switch. 5. Toggle OFF: The LED on both sides are off, the LED from the top is controlled by the foot switch. Input Impedance: 1M Output Impedance: 2M Working Voltage: DC 9V (center ) Working Current: 120MA Power: DC 9V Battery/ DC 9V adapter (not included) Dimension: 130(L) x 110(W) x 50(H) mm Weight: 416g Model Number: R-19 Type: Effects Product name: R-19 AVALLON Compressor Effect Pedal For Electric Guitar Feature 1: compressor guitar effect pedal features a re- of the classic compressor, with low noise Feature 2: The attack adjustment is designed for bass or high-output active pickups to better suit the instruments Feature 3: The true Bypass design minimizes tone loss color:As shown : Package Contents: 1 x Guitar Pedal Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.