Noise-cancelling headphonesShut out the world with the Sony EXTRA BASS WH-XB900N Wireless Bluetooth Noise-Cancelling Headphones. Noise-cancelling technology filters out background sounds, so you can focus on your playlist.Just touch the right earcup to let in ambient noise, such as platform announcements.EXTRA BASSEXTRA BASS does what it says on the tin. Low-end frequencies are enhanced, so every track is lifted by a punchy bassline. You get the full power of the vocals too, so every song sounds good enough to sing-along to.All-day batteryThe WHXB900N Headphones have a battery which really does last all day. You get up to 30 hours of playback, so you won’t need to remember to charge them every night.Voice assistantGet a playlist based on your mood, check film times for your local cinema, turn your smart thermostat up on the way home, and much more. Life is easier with your phone’s voice assistant – that’s why the WH XB900 Headphones have one touch access to Google Assistant and Amazon Alexa.