MOOER MCS1 YELLOW COMP OPTICAL COMPRESSOR MICRO EFFECTS PEDAL ( The BLUE COMP is no longer in production it now is YELLOW same comp and improved )Mooer YELLOW Comp Optical Compressor Guitar Effects Pedal.Legendary optical compressor, incredible smooth sound.Normal: Normal sustain of low noise, long sustain is obtained, Treble: Sustain of high frequency is emphasized,Full metal shell,Very small and exquisite,True bypass, ?DC 9V Adapter power supply required (not supplied).SPECIFICATIONS: Effects Modes: 2 (Normal, Treble) Input: 1/4” monaural jack (impedance: 220k Ohms) Output: 1/4” monaural jack (impedance: 10k Ohms) Power Requirements: AC adapter 9V DC (center minus plug) Current Draw: 7 mA Dimensions: 93.5mm (D) × 42mm (W) × 52mm (H) Weight: 160g