NOTE : if get no microphone then check the settings on computer/laptop or softphone app you are using, need to change microphone input setting to USB or try different input setting and it will work. In some plantronics wireless headset model, customer change the dial setting underneath the base and it work. Compatible with wireless headset system by Plantronics such model CS50 CS55 CS351n CS361n CS70n CS540n CS540 CS530 CS510 CS520 C054 C052 CS55 Jabra Pro 920 GN9125 GN9120 Sennheiser D10 Wireless Headset. NOT compatible with EHS cable. Easy Setup : plug the USB end into your computing devices, plug your plantronics wireless headset or a compatible models RJ9 headset into the RJ port end. On your computing devices, go to audio setting, and change your audio setting both input and output to USB audio device. Convert your exist wireless desktop headset system into a wireless headset system work with your coputer pc laptop mac tablets windows softphones. SEE COMPATIBLE LIST IN DESCRIPTION. Convert your exist landline RJ9 plug headst into USB plug headset for computer PC laptop mac tablets softphone. SEE COMPATIBLE LIST IN DESCRIPTION.