Sennheiser's HD4. 50s give you superb sound quality, the fantastic freedom of a wireless connection, and active noise cancellation to ensure full, distraction-free immersion in the music. With intuitive ease of control, an elegant but robust design and built-in mic to allow hands-free calls on the go, this is the ideal audio companion for music aficionados with active lifestyles. Stunning Sennheiser Sound These closed-back over-ear headphones produce a detailed, rich and powerful sound. Proprietary Sennheiser drivers see that the mids and trebles are delivered with clarity and dynamism while bass frequencies are warm and mighty. Read more… NoiseGard Noise Cancelling Get lost in your music, listen to only your music. Sennheiser's NoiseGard active noise cancellation makes sure the ambient noises around you to do not impinge on your listening pleasure, so you can fully enjoy all the detail in the music. Bluetooth & NFC Say goodbye to a wired connection and feel the freedom. Connecting by Bluetooth or one-touch NFC, it's simple and quick to connect your smart device. State of the art wireless technology and AptX audio codecs ensure the quality Hi-Fi sound of Sennheiser is reliably reproduced without the need of cable clutter. Calls on the Go With a high quality microphone built into the headset you can easily switch between listening and talking so you can take hands-free calls on the go and nothing slows you down. Built-to-last Battery Charging via USB, the battery is built to easily last all day. It'll keep you in wireless, distraction-free music for up to 19 hours. Or, if you choose to keep the noise cancelling switched off, up to 25 hours. Quality Design Constructed from high quality materials, ergonomically-designed ear pads ensure superb audio delivery, and a comfortable listen, even over extended sessions. Controls mounted on the ear-cups make adjustment and call-handling simple and intuitive. And when you're done, the HD 4. 50s fold away into the included carry case for easy storage.