Used Seymour Duncan STUDIO BASS COMPRESSOR Effect Pedal

-Compression Ratio: Soft-knee, adjustable from 1:1 to > 20:1-Maximum Compressor Gain: +33dB-Attack Speed: Adjustable from 8ms to 27ms-Input Impedance: 1 Megohm-Output Impedance: 2.75K ohms maximum-Maximum Input Level: 3 Vrms-Distortion: < 0.3% at 300mV RMS output at 1 kHz-Noise referred to Input: -110dBV, 400 Hz - 20 kHz, input shorted-Compressor Type: Voltage Controlled Amplifier (VCA)-Power: 9V battery or 9V to 18 Vdc regulated adapter, center pin negative polarity-Current Consumption: 21mA operate, 19mA bypass-Dimensions: 2.60" wide X 5.0" long X 1.45" high-Weight: 0.67 lbs.