RJ9 headset adapter extension cord convert from male RJ9 to female RJ9 adapter with a cable in lenght of 45 inches or 3.75 Feet long, compatible with any telephone that has an RJ9 port for headset or a handset port, plug and play, no extra setup required, this will work as extension cord cable or use it as a quick release connector to walk away from the conversation then return just plug back the headset and resume the conversation. Compatible with all direct connect RJ9/RJ10 headsets Plantronics, Jabra, GN Netcom and phones with RJ9/RJ10 direct connect headset jack