RJ9 4P4C to 3.5mm Telephone Adapter Cable RJ9 Female to 3.5mm Dual Male Stereo Plug Adapter for PC&Telephone Headset Conversion Does not work with RJ11 (which is the size of the phone jack in the wall, larger than headset phone jacks) Total length (End to end length):45 cm/13.7 inch Package:1pcs* RJ9 to dual 3.5mm Telephone Adapter Cable( black). See more

Does not work with RJ11 (which is the size of the phone jack in the wall, larger than headset phone jacks). Use PC Headset with most VOIP phones that have a RJ9/RJ10/RJ22 headset jack. (Not compatible with RJ11). If your RJ headset is compatible with one of the phone models listed below, then this adapter can help convert to work with your 3.2 mm jack cell phones.Otherwise don't buy it. Female RJ9 to Male 2 pcs 3.5mm plug headset adapter. Save money by using your existing RJ headset to work with your PC. This RJ9 Female to 3.5mm Dual Male Stereo Plug Adapter can convert 4P4C RJ9/RJ10/RJ22 headset to dual 3.5mm plug for computer: one 3.5mm plug is for Speaker, the other one is for Microphone.