... .3 mm 3.pole: 2 pole, 3 pole, 4 pole. Various stereo connector specification :1.male,female.2.O D: 2.5 mm , 3 ... .5 mm , 6.3 mm3.pole: 2 pole, 3 ... ;2.Withstand voltage: 300v DC min.3. 3.Insulation resistance: ≥ 5MΩ Min.4.Contact resistance: ≤ 5ΩMax5.ROHS or REACH. 3.5mm stereo plug ...