The Andrea Communications WNC-2100 features a noise-canceling microphone with semi-rigid boom rotates 360 Degree for left or right side usage and has digital sound enhancements with DSP technology. The 30mm mono (monaural) speaker delivers crystal clear audio, and the durable padded headband and plush leatherette ear cushion provides all-day comfort. Easily pair two devices simultaneously with your mobile phone, tablet, or computer (Windows/Mac). Enjoy up to 12 hours of talk time with an operating range of up to 30 feet and special features, including voice dialing, call waiting, and last number redial. Includes handy carry case for storage and portability.