The Blackwire C3220 corded UC (Unified Communications) headsets are durable, lightweight and easy to connect. -Hi-fi stereo, PC wideband audio with noise-canceling microphones for high-quality PC telephony. -Ideal for users transitioning to PC telephony for webinars, conference calls, music, and other multimedia applications. -Combine the comfort and durability of a corded headset with greater flexibility-all at an entry level price point. -Hearing protection: SoundGuard: Acoustic limiting for protection against sounds above 118 dBA -Compatible with Windows or Mac OS