Visit Amazon sites : br Jabra UC VOICE 750 MS Duo (Dark) Lync Optimized Corded Headset for Softphonebr br HD Voice - High quality audio for crystal clear conversations Enjoy high-definition sound with HD Voice and get crystal clear intelligible communication br UC Plug-And-Play - Jabra devices feature intuitive call control and seamless connection to all leading UC applications and softphones br Flexible boom arm tip for optimal positioning - The Jabra UC Voice 750 headset has a flexible boom tip arm to ensure the ideal microphone placement br Noise Canceling Microphone reduces unwanted background noise and the noise-canceling microphones reduce unwanted background noise and are ideal in crowded and noisy open office environments br Peak Stop - Peak Stop technology immediately removes potentially harmful loud sounds or tones before they reach your ears and keeps the sound level within the safe range to protect your hearing