Balancing and impedance matching for guitar, bass, keyboards & synthesizers Eliminates ground loop hum thanks to galvanic transformer isolation Extremely fail-safe, no power supply required THRU-output for passing the input signal to the amplifier THRU-output jack can also be used as second input to sum two input signalsPure and unaltered low-noise audio Handles even high-level inputs without distortion Switchable 30 dB pad for extremely high input levels (e.g. amplifier output)Solid casing made of aluminium and steelIncl. rewritable tour label for attachment onto the back of the wipper Engineered in Germany