This is the modfiied version of the Plantronics P10 with more sensitivity for higher output. PBX and ACD operators can enjoy the comfort and convenience of Plantronics' technology with the Plantronics P10 plug prong adapter. The P10 adapter works with your choice of Plantronics H-series headsets so you can choose the style that best meets your application needs. Just plug the P10 adapter into your operator console, PBX, or ACD, then plug in your headset. The P10 adapter delivers Plantronics' famous sound quality and ease of use. Its volume and automatic gain controls let you adjust incoming calls to a listening level that's comfortable for you. Comes with handy Quick DisconnectTM feature and 10-foot coil cord.