Plantronics HW121N Entera Binaural USB Stereo/Single Headset product also known as VoIP Headsets or Communications Headsets. Transmit performance Noise-canceling microphone filters out background sounds for heightened speech clarity. Robust audio As enterprises adopt UC and VoIP, they want to take advantage of wideband telephony to deliver natural-sounding audio and decrease listening errors and repetition. Flexible design Adjustable boom angle, capsule angle (front-to-back and up-and-down), and microphone-to-mouth distance maximize voice quality. Key Features: VoIP Headsets Plantronics Entera HW121N with noise cancelling microphone Product type: Binaural Headset, Wearing style: Stereo/Single Head-band, Recommended usage: Communications Office/Call center Connectivity technology: Wired via Da40 USB adapter (Not Included) Ear coupling: Stereo or Mono (Left or Right) Specifications Grip: head clip design: for both ears adjustable microphone: yes frequency range: 150 Hz - 6800 hz Microphone: yes Connector: QD for quick disconnection Headgear: foam Connection to PC and phone: via Da40 USB adapter (Not Included) Colour: Black weight: 60 g. In the Box 1 x USB Headset Plantronics HW121N Entera Binaural