RAYSUN Dual 3.5mm Audio Female Headset Socket to RJ9 Adapter Convertor for Connecting Analog Headphone Headset to Chat Telephone 1, Dual 3.5mm headset to RJ9 adapter converter ; 2, Allows to use your favorite computer analog headphone to chat on telephone 3, 3.5mm socket - Mic and headphone, designed for use with headsets that have two 3.5 mm. plugs; one for the microphone and one for the headphones/earpiece(s) 4, Cable Length - 25CM; 5, Package: 1 x RJ9 to 3.5mm cable adapter.