New Plantronics Electronic Hookswitch App-5 Polycom Control Adapter 300 Foot Range Easy Connect Plantronics headset hookswitch control adapter. Enables remote ring alert and call answer/end capability on wireless headset. 300 foot range. Easy to connect. Supports Plantronics CS50, CS55, CS70N, CS351N and CS361N wireless headset systems, and Plantronics Voyager 510S Bluetooth headset system. Our most popular model.