... 6.3 mm 3.pole: 2 pole, 3 pole, 4 pole. Various stereo connector specification :1.male,female.2. ... 2 pole, 3 pole, 4 pole.4.shell: gold plated,Ni-plated.5.Color:black ,blue.Cable of using usually specification ... 0.3mm-25m (for optional)8.OD:2.5-4.0mm(for optional).Quality :1.100% open or ... 3.Insulation resistance: ≥ 5MΩ Min.4.Contact resistance: ≤ 5ΩMax5.ROHS or REACH. 3.5mm stereo plug to jack av cable