Reverses the polarity of any 2.1mm 'Boss standard' power barrel plug. Consists of 1 x female 2.1 socket and 1 x male 2.1 barrel plug (with reversed wiring); about 3" long.
Used to power 2.1 center-positive pedals (MoogerFooger, some Fulltone, etc.) from standard 2.1 center-negative power sources, like those from Boss, Dunlop, etc.
