https://youtube.com/watch?v=L32Wshly8H0

On the track, in the pool or under the ocean, the WF-SP900 headphones are all you need to take you further than ever before. With a truly wireless design and 4GB of on-board storage so you can listen anywhere.
Learn more about WF-SP900: https://www.sony.co.uk/electronics/truly-wireless/wf-sp900