VONOTO 3.5mm to RJ9 Audio Adapter Cable - 3.5mm audio female socket to RJ9 Modular Plug Adapter Cable for connecting your own Analog Headphone to chat on telephone (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; Length:25cm NOTE: NOT work with Avaya 9620C, Avaya 9608, Cisco 7942 ,Avaya 621xx. NOTE: There are 2 slots - one for mic works and one for headset works. Specs: This amazing adaptor converts the standard phone headset 3.5mm plug to an RJ9, RJ10, or RJ22 headset plug, allowing you to use your favorite 3.5mm headset with your office IP phone.