The MXR Custom Comp effect pedal is built from the finest components available and designed with a blend of modern and classic compressor technology. At the heart of the compressor pedal resides the legendary and rare CA3080 "metal can" IC that delivers increased dynamic range, greater transparency, and quieter operation. In addition, the MXR Custom Shop design team included RF suppression components into the compressor pedal for interference-free operation, and an internal attack control that allows fine-tuning of the speed of the note's initial attack. Combined with a TPDT (Triple Pole Double Throw) switch for true bypass and heavy-duty pots, the MXR Custom Comp CSP202 compressor pedal will provide years of high performance live and in the studio. The MXR compressor pedal can be powered by one 9V battery (sold separately).