2201 Booster Flex Type 1 (Voltage Converter)

Type 1 Flex cables are black and fitted with a center negative plug. Booster Flex is a special Flex cable with a little step-up converter built-in on the middle of the cable which doubles the voltage. You should only use it with low current pedals which draw below 50mA, typically wah pedals and drives. You can get 18V from a single 9V outlet.