RockBoard Power Ace Polarity Converter - 2.1 x 5.5 mm barrel plug ( - ) center to (+) center 2.1 x 5.5 mm barrel socket
- Power supply adapter cable for effect pedals
 - Flat compact design
 - 2.1 x 5.5 mm female barrel connector (-) center to 2.1 x 5.5 mm barrel plug (+) center
 - Inverts polarity from (-) center to (+) center
 - For effects pedals with polarity (+) center power supply sockets