Yealink UH35 USB wired headset features a 35 mm speaker with superb stereo audio, offering a premium auditory experience during calls and music listening. Its dual mics with advanced noise cancellation technology ensure clear conversations, while the ear cushions made of noise isolating foam in an oval shape provide effective passive noise blocking, constructed from high-grade plastic and reinforced with a metal frame. The skin-friendly materials, soft memory foam, and ergonomic ear-fitting design deliver a comfortable experience all day long, The busylight will automatically glow red when you are on the call or in the meeting to reduce external interference and improve work efficiency. You can also manually turn on the busylight to indicate your working state directly and block outside distractions