Feature:1. Very Low Noise: This dynamic compressor is characterized by re creating the classic Ross compressor with very low noise.2. Real Bypass Design: Pedal has a real bypass design, which minimizes the loss of tones and provides transparent tones.3. 3 Adjustment Knobs: There are 3 adjustment knobs, maintain, attack and level. Attack adjustments are designed for bass or high output active pickups to better suit the instrument.4. Paint Finish: This is an electric guitar effect device with paint finish, simple design and interface, high quality components, and sensitive knobs.5. Metal Material: This electric guitar pedal is made of classic all metal material, which is stable and powerful, with transparent and clear sound and stable voltage.Specification:Item Type: Dynamic Compressor PedalColour: GreenMaterial: MetalInput Impedance: 500KOutput Impedance: 10KWorking Current: 8mAPower Supply Mode: 9V Battery x 1 6F22 (Delivered Without Battery) or 9V Power Adapter (Not Included).Package List:1 x Effector1 x User Manual