TSV prvides two types of USB Headset(U11/T900) with noise cancel microphone & comfortable wearing & volume control for office cal center computer Over-Ear Headphones. In terms of details, these TSV Business-grade Wideband USB Headsets are equipped with digital signal processing (DSP) & noise-canceling mic, and acoustic shock protection(ASP) for crystal-clear conversations and better protect your hearing. The full range of 40MM (T900 Only 30mm) speakers delivers superior audio sound quality. Ultra-lightweight binaural USB headset with adjustable headband to fit all head sizes, 270-degree flexible mic boom to suit your preference and soft and high-quality ear cushion to enhance all-day wearing comfort. The USB Headset is easy to access volume and mute controls in the cord, you can quickly adjust the headset volume up/down, and mute/un-mute the microphone or speaker. Plug and play, no drivers needed, and directly connect the headset to a USB-compatible device. The impedance of the headset is only 32 ohms. The two-meter cable length allows you to freely change your posture and stretch out when working. The U11/T900 USB Headset is compatible with Windows 2000 /7 /8 /10 /XP /Vista, Mac OS X, and the leading UC Platforms, Softphone. The On-Ear USB Call Center Headset is ideal for Skype chat, business, call center, conference calls, dictation, dragon speak online courses, webinar presentations, and more. I believe you will not regret choosing them.