Poly Encore Pro 310 is a wired noise-canceling headset for call centers and offices with a QD (Quick Disconnect) cable. The QD makes your wired headset into easy to use headset that will unplug and plug via a compatible Plantronic - Poly adapter. Encore Pro 310 features mono audio to let the user stay in touch with their surroundings in the office. The headset gives HD audio with a noise-canceling microphone on a flexible boom. Connect Encore Pro 310 to a desk phone or into your computer (requires adapter) Poly Encore Pro 310 includes dynamically switching frequency response to ensure sound levels are always at their best for comprehension. The soft earpad and lightweight design gives the user all-day comfort in the contact center. Flexible microphone boom â Note: This headset requires a Plantronics style USB adapter (ie DA70), Direct Connect Cable (ie U10p) or Telephone Adapter (ie M22) to connect it to your device