Introducing Sony's WH-ULT900N. Featuring huge, powerful bass, next-level clarity, and seriously impressive noise cancelling, take the ULT POWER SOUND experience wherever you go. With amazing audio impact and breath-taking detail, they're ideal for the bass obsessives. ULT POWER SOUND At the tap of the ULT button, these headphones offer two unique sound settings to deliver exhilarating audio experiences for power sound obsessives: Deep Bass, adding huge resonating depth to the lower frequencies, and Attack Bass, bringing impressive drive and energy to the music. And thanks to its Noise Cancelling and Ambient Sound modes, you can choose to eradicate external sound, or stay safely aware of your surroundings, using the WH-ULT900N however you want, wherever you are. Clear calls always, plus Multipoint Connection Hands-free calls are clear and easy to understand, even when you're surrounded by noise. You can connect WH-ULT900N to two devices at the same time using the Multipoint Connection. So, if you're listening to music on your laptop and then get a call on your phone, the sound will switch over automatically without needing to press any button. Superb battery life, serious comfort The battery life is impressive. Even with noise cancelling on, you can keep the beats playing for 30 hours straight, and since WH-ULT900N are designed to be seriously comfy, you can keep even the longest playlists going without compromise.