3 pole female XLR receptacle, grounding: mating connector shell to pin1 and front panel, vertical PCB mount, retention spring instead of latch Most cost-effective round plastic body XLR PCB mount panel connector. Front panel cutout and PCB layout 100% compatible to A series. "Tulip" type contact design with high contact pressure for highest durability. Flammability rating UL94HB. UL recognized component.