Behringer CL9 is a compressor/limiter pedal designed to provide smooth compression and extended sustain for electric guitar and bass. With its high-performance features, you can compress loud and boost low signals without compromising the original sound quality. Adjust the attack time to control the response to input signal peaks, set the level for output volume, and use the sustain control to determine the compression amount. The CL9 has a rugged metal chassis, 1/4-inch TS input and output connectors, a DC input for a 9V power supply, and a battery compartment for a 9V battery.