... 2.O D: 2.5 mm , 3.5 mm , 6.3 mm 3.pole: 2 pole, 3 pole, 4 pole. Various stereo connector specification ... 2.O D: 2.5 mm , 3.5 mm , 6.3 mm3.pole: 2 pole, 3 pole, 4 pole.4.shell: gold ... using usually specification :1.1C+S,2C+S ,2C+D2.Wire:26AWG,28AWG,30AWG3.Sprial:BC/TC/CCS/CCA;0.10mm ... % open or short test;2.Withstand voltage: 300v DC min.3. 3.Insulation resistance: ≥ 5MΩ Min.4.Contact resistance: ≤ 5ΩMax5. ...