Sennheiser MB 660 UC MS is a wireless headphone, Skype for Business certified, adaptive ANC headset designed for knowledge workers demanding business-grade communication and premium Sennheiser sound quality for maximum productivity in open offices. By constantly monitoring your background environment for noise, Sennheiser's NoiseGard hybrid adaptive ANC technology seamlessly adjusts the level of noise reduction in your headset. This unique technology enables you to take control of your sound environment, so you can have a productive, disruption-free workspace. Business-grade communication voice clarity is key to success in every organization. The Sennheiser headphones MB 660 is both a wireless and wired solution in one. The MB 660 delivers a certified, business-grade communication experience, whatever your UC environment might be. Create your own sound with a choice of sound effect modes to get the best personalized sound for speech, music, and entertainment. The MB 660 headphones deliver stereo audio and CD-quality streaming with aptX in Sennheiser's renowned high-quality, for your ultimate sound experience. We haven't compromised on a single detail with the Sennheiser MB 660 headphones. In addition to taking noise cancellation to the next level and delivering the renowned Sennheiser signature sound, the MB 660 headphones have been designed to be the ultimate business tool for maximizing your productivity. Bundle includes: Sennheiser Headphone MB 660 UC MS Bluetooth dongle Carry case Audio cable USB cable In-flight adapter Quick guide Safety guide Mobile wallet