Poly (Plantronics) EncorePro 320 Mono QD (quick disconnect) is a dual ear, over-the-head headset with foam ear cushions. The Poly EncorePro 320 QD is an entry level, affordable headset for the office or call center workers.  Equiped with noise canceling microphone with HD sound.  The dual ear speakers helps the worker block out unwanted noise to help him focus on the call. Plus acoustic protection and voice optimization. So they can perform at their best throughout their shifts