Top features: – Block out unwanted sound with NoiseGard noise-cancelling – Listen to CD quality sound wirelessly with Apt-X technology – Built for comfort with a fold-flat frame for portability – All day battery life lets you listen for up to 30 hours – Earcup controls let you control your audio in an instant Block out unwanted soundBlock out unwanted background sound in even the most chaotic of environments. NoiseGard Hybrid adaptive noise cancelling technology makes sure the only sound you hear is your music, so even on the train it’s easier to enjoy your tunes on-the-go.CD quality audioApt-X technology delivers CD quality sound without the need for wires. It reduces the size of audio files so they can be sent to the headphones without affecting the sound quality, so even when you’re not at home, your music will still sound as good as it does from your CD player.Fold flat for portabilityA fold-flat collapsible frame lets you discreetly fold away the Sennheisser PXC 550 BT NC headphones to store away in its compact travel case without taking up too much room in your bag or hand luggage.30 hours of battery lifeA rechargeable battery delivers up to 30 hours of listening when plugged in using the optional detachable cable, or a generous 22 hours of wireless listening, even when using noise cancellation. However you listen, you’ll always have enough battery life for all-day listening without having to recharge.Earcup controlsIntuitive on-earcup controls let you control the volume, and play, pause, and skip your tracks without you having to reach into your pocket for the remote control. All the controls you need are located on your ears.