Plantronics APS-1 EHS (Electronic Hook Switch)

APS-1 EHS (Electronic Hook Switch) cable for specific Plantronics headsets (Savi 700 Series, CS500 Series, and the Savi Office Series) and specific Aastra / Mitel telephones (6737i / 6739i / 53i / 55i / 57i / 57iCT / 6865i / 6867i / 6869i). Note: Aastra / Mitel DH cable is required for models 53i / 55i / 57i / 57iCT in order to have EHS functionality, and DH must be enabled in the Aastra / Mitel telephone settings. No returns on opened items. Pricing valid while inventory last. Same as HP 85Q78AA