Keeley Compressor GC-2, Effects Pedal for Guitar, Compressor, Controls: Gain, Threshold, and Compression, Input impedance: 1 Megaohm, Output impedance: 100 Ohm, Output voltage gain: +30 dB, Bandwidth: > 20 kHz, Total Harmonic Distortion: 0.1%, Noise: -95 dBV, Voltage input: 9.6V, Power consumption: 15 mA, Powered via 9V battery or optional 9V DC power supply, Corresponding power supply: Article Nr #409939# (not included, must be ordered separately)