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: 1MOutput Impedance: 2MWorking Voltage: DC 9V (center )Working Current: Greater than 120MA: DC 9V Battery/ DC 9V adapter (not included)Dimension: 130(L) x 110(W) x 50(H) mmWeight: 416g Number: R-19Type: EffectsProduct name: R-19 AVALLON Compressor Effect Pedal For Electric GuitarFeature 1: compressor guitar effect pedal features a re- of the classic compressor, with very low noiseFeature 2: The attack adjustment is designed for or high-output active pickups to better suit the instrumentsFeature 3: The true Bypass design minimizes tone losscolor:As shownMaterial:aluminium alloyPackage Contents:1 x Guitar PedalOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.