DISCONTINUED Genuine Plantronics Accessories Headset Adapter For Qualcomm 860/1960/2760 Series Cellular PCS Phones. The headset adaptor allows you to use the Plantronics headset of your choice with your CDMA portable phone. It plugs into the connector at the base of your phone and provides a standard 2.5mm audio headset jack. Audio performance may be adversely affected if used with other earpieces. Works with the Qualcomm QCP-860, QCP-1960 and QCP-2760 Thin Phones. Note: Choose your favorite headset to plug into this adapter.