The UI 760 is the newest Sennheiser corded amplifier. It connects to both your office telephone and your PC at the same time (with the use of the ).To maximize ease-of-use and efficiency, the UI 760 offers built-in microphone mute and dynamic volume control features. The sound clarity system significantly improves the sound quality of the people you speak with on the phone. This amplifier is compatible with almost every telephone system and is a great choice for reliability and quality.