Plantronics EHS APU-75 Electronic Hook Switch Adapter 

• Plantronics EHS APU-75 is an electronic hook switch cord that allows plantronics CS500 and CS500 XD series wireless headsets to be connected to your PC. 
• it provides you with wireless headset connectivity when using a wide array of softphones.
• Plantronics EHS APU-75 Electronic Hook Switch Adapter provides plug and play compatibility with Microsoft Skype for business.