Duttek 2 X 3.5mm Headset Cable to RJ9 Jack Adapter Convertor for Connecting your own Analog Headphone Headset to chat on telephone (2 X 3.5mm to RJ9) Get this headset adaptor then you can use your favorite computer analog headphone to chat on telephone. Connector A: 2* 3.5mm female ,Connector B: RJ9. Dual 3.5mm audio female socket to RJ9 Modular Plug Adapter Cable for connecting your own Analog Computer Headset with Dual 3.5mm Audio plugs to Your own Cisco phone headset jack with RJ9 modular socket Length:25cm