Yealink UH38 Headset is a dual noise cancelling microphones that show outstanding call performance even in high pressure and noisy office environments, allowing you to hear and be heard with world class audio quality, with dual voice mode and automatic switch with a powerful leak-tolerant speaker and cutting-edge audio algorithm identification to ensure high fidelity and best experience of audio. Dual Busylights indicators that are visible in 360°m available to be activated by calling automatically or manual operation, indicate your working state. Dual Mute controls by raising the Mic-Boom or bottom of the control unit that contributes to easier call management.