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 Pedal Colour: Green Material: Metal Input Impedance: 500KΩ Output Impedance: 10KΩ Working Current: 8mA Power Supply Mode: 9V Battery x 1 6F22 (Delivered Without Battery) or 9V Power Adapter (Not Included). Package List: 1 x Effector1 x User Manual