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 sound2. 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 results3. 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 needs4. 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 show5. TRUE BYPASS: The true bypass design provide transparent tones, and the signal remains completely intact through the effects pedal during transmissionSpecification:Item Type: True Bypass Guitar PedalDescription: Classic optical compression sound with smooth attack and decay, while retaining the original signal transientMaterial: Metal shellColor: RedModel: CompressorPerformance: True bypassInput: 1 or 4in Mono Jack(impedance: 470K ohm)Output: 1 or 4in Mono Jack(impedance: 1K ohm)Power Requirement: DC 9V(negative center)Operating Current: 12mA.Package List:1 x Guitar Pedal1 x User ManualNote:Require DC 9V adapter(not included) power supply.