A cable with a 5.5/2.1 socket at one end and a 3.5 mm mini-jack connector at the other. The tip of the mini jack is connected to the outer part of the 5.5/2.1 connector. This means that if a cable is connected to any DC output in which the polarity is center negative, then the tip of the mini jack will have positive supply (tip positive). Only such polarity is allowed in effects with a mini jack connection.
Cable lenght: 50cm.