Century SC 638 are premium wired headsets for all-day use optimized for narrowband desk phones in busy contact center or offices. Sennheiser's ultra noise-canceling microphone has been improved to optimize speech transmission and intelligibility in busy contact center and office environments by reducing unwanted background noise. Century is designed for long-hours use throughout a working day - and that means everything focuses on wearing comfort: from the large leatherette ear-pads to the unibody headband construction for maximum strength at stress points to ensure a truly comfortable communications experience.