• Manufactured by VXI Corporation to be used on their P series headsets to connect them to the Plantronics amplifiers, M10,M12,M22,MX10,AP15's.
• Can also use them to directly connect to any Cisco 7900 series phone
• You can use these on any headset that has a Plantronics compatible quick disconnect on it, does not have to be just a VXI headset
• PLT QD on 1 end, RJ9 on the other