3 pole XLR female - Mono 1/4" plug (Tip, Sleeve contact). Wired according to IEC 268-12: pin 2 = signal pin 1 and 3: connected to ground. Features: Versatile, pre-wired and ready to use adapters to reliably interlock various connector systems Professional look and compact space saving design, based on the X Series (XLR worldwide accepted standard) Rugged diecast shell for best reliability.