The Plantronics APS-11 Electronic Hook Switch can be used in place of the Plantronics HL10 Remote Lifters. It works on these Plantronics Wireless Headsets: Plantronics CS500 Series: CS540,CS530,CS520,CS510. Savi Series: W740,W730,W720,W710, WO100,WO200,WO300,WO350.
THe APS-11 EHS is compatible with these telephones.
Siemens:Optipoint 410,Optipoint 420,Optipoint 500,Optipoint 600,OpenStage 40,OpenStage60.OpenStage 80
NOTE: This APS-11 EHS adapter requires an initial "wake up" by pressing the headset button on the phone. This is a one time "wake up" unless the product is disconnected.