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. Or contact seller for technical support. ONLY 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, no extra software drivers. Need change your computer device sound audio setting to USB device : In windows click Start > Setting / Control Panel > System / Hardware and sound > Sound , Make sure USB device shows a green check mark in Input / Recording and Output / Playback tabs. Convert your exist wireless desktop headset system into a wireless headset system work with your coputer pc laptop mac tablets windows softphones. SEE COMPATIBLE WIRELESS HEADSET LIST IN DESCRIPTION. Convert your exist wired RJ9 plug headset into USB plug headset for computer PC laptop mac tablets softphone. SEE COMPATIBLE WIRED HEADSET LIST BEFORE PURCHASE.