• Equipped with a newly developed high-quality sound ring driver, a new style that allows you to listen to music while listening to music and outside sounds naturally. Does not cover the ear hole, so it won't get stuffy, and is gentle on your ears. The specially designed 0.5 inch (12 mm) ring driver and processor deliver high quality sound • The lightest wireless earbuds in the history of Sony with half the size of the WF-1000XM4. Weighs only 0.1 oz (4.1 g) on one side. Combined with an open style that does not cover your ears, so you can use it for a long time without getting tired • High quality call performance: Uses AI technology for high precision phone calls. Algorithms designed to only pick up caller's voice for clear calls • New Smart Performance: Not only is the earphone itself, but you can adjust the volume, playback, pause, and skip songs by tapping around the ear • Complete basic performance: 5.5 hours of playback, and the case can be charged for 12 hours. 10 minutes charge for 90 minutes of playback and fast charging. IPX4 Splashproof