The 1 SPOT Voltage Doubler (TVD) is an intelligent cable that mainly serves for the conversion from 9V to 18V, but can also automatically convert the voltage from 12V to 24V, without switch! Can handle currents up to 100mA, can help you power virtually any 18V or pedal 24V. All you do is take the exit of yours 9V or 12V power supply, connect it to the Voltage Doubler e connect the TVD to the pedal. Simple. Silent. Shortly expensive.