One Control Raspberry Booster , Effect Pedal for Electric Guitar, Overdrive, Flexible gain boost maintains sound characteristics, Z-knob controls input impedance from 9.8k to 319k, Can be used in conjunction with various pickups, amplifiers and effects, Should be placed at the beginning of the signal chain to make best use of the Z-regulator (impedance), Developed by Bjorn Juhl, True bypass, Controls for Master, Z, Gain, Bypass footswitch, Status LED, Brushed aluminium housing, 6.3 mm mono jack input / output, Power supply via 9V battery or 9V DC power supply unit, 2.1 x 5.5 mm barrel plug, polarity (-) inside (battery and power supply unit not included), Current consumption: 1.5 mA, Dimensions (L x W x H): 100 x 47 x 48 mm, Weight: 160g@+*Note:* Register your product at www.w-distribution.de/Warranty and extend the warranty to 4 years.