Power supply connector: 2.1 mm coaxial plug (angle)
Pedal connector: 3.5 mm mini jack (angle)
Polarity: Standard (positive tip)
The 3.5mm miniplug cable connection is compatible with older / vintage pedals such as MXR, DOD, Electro-Harmonix, Pro Co (Rat-series), clone Centaur and vintage (non-LED) Voodoo Lab