Yealink UH37 Mono Teams USB-C/A. The UH37 professional headset features professional-grade 35mm speakers, superb stereo sound, and dynamic EQ (Automatic switch between call mode and music mode), giving clear sound in call mode, high fidelity in music mode. You don't miss any details, focus on the tasks, and burst with fresh ideas whether you're meeting or listening to music during work. When you're on the call, UH37's busylight will turn on automatically. UH37 office headphone allows mute in two ways: by lifting the Mic-boom or by pressing the mute button. The boom's 300-degree rotation allows for left or right ear wear. This convenient and flexible design will let you feel more at ease when communicating