The Keeley Compressor Pro is a studio-level compressor that delivers total customization over frequency response. This pedal includes a 7 Segment LED display for metering compression and gain reduction while also showing Gain Reduction levels. There's a Threshold Indicator, Exact RMS Analysis reader that measures input, and a Hard/Soft Knee Compression for manipulating sustain and adding softer more natural compression. There's also an Auto Mode that programs Attack and Release times for easier use and a Ratio Control for additional settings. This pedal has scratches on the back and comes with the original box and packaging.