One of the most popular Plantronics corded headset No.64338-31options on the market, the HW251N combines lightweight design with improved sound quality along with a Noise-canceling microphone. The the Supra Plus HW251Nwideband monaural headset delivers the highest level of audio performance even in noisy environments. The Plantronics Supra Plus HW251N helps overcome the challenges posed by traditional technology, delivering heightened speech clarity and life-like fidelity. Users will experience greater satisfaction through enhanced intelligibility and reduced miscommunication. Before you buy: Use the Plantronics HW251N with any of the following that meets your needs: Inteli Cord - Connects Headset to Headset port on your desk phone: Cord Adapter Avaya Cord - Connects Headset to select Avaya phones: HIS-1 Adapter Plantronics adapter with volume/mute controls for your desk phone: M22 Plantronics USB adapter for PC/MAC: DA45 Plantronics Features Monaural design headset speaker covers only 1 ear Noise-canceling microphone cuts 60-70% of background noise Quick Disconnect cord and leave your headset on while you walk away from your desk All-day wearing comfort and reliability Supports all Plantronics amplifiers and USB-to-headset adapters Designed for the most demanding environments.