Feature: 1. ADVANCED COMPRESSION PEDALS: Comprehensive pedals smooth the dynamics between high and low frequencies without lowering the soundtrack, giving you a more even, robust sound 2. MULTI FUNCTIONS: With easy to use tone control, Comp(compression strength), tone(brightness) and LEVEL(output volume) can be used for different purposes, these dedicated controls give you superior sound shaping results 3. TWO PRACTICAL MODES: The guitar compression pedal also offer NORMAL and TREBLE mode selection switches, and the signal can be transmitted in both modes to meet your various playing needs 4. WARM AND CLASSIC SOUND: Proprietary electronic components and circuit design provide more versatility for sound shaping while still providing dynamic response. Just enjoy the warm, smooth and classical sound at your show 5. TRUE BYPASS: The true bypass design provide transparent tones, and the signal remains completely intact through the effects pedal during transmission Specification: Item Type: True Bypass Guitar Pedal Description: Classic optical compression sound with smooth attack and decay, while retaining the original signal transient Material: Metal shell Color: Red Model: Compressor Performance: True bypass Input: 1/4in Mono Jack(impedance: 470K ohm) Output: 1/4in Mono Jack(impedance: 1K ohm) Power Requirement: DC 9V(negative center) Operating Current: 12mA. Package List: 1 x Guitar Pedal 1 x User Manual Note: Require DC 9V adapter(not included) power supply.