SMART SOUND- Smart features and settings learn from your behavior and automatically adjust sound settings to provide the right sound for the moment. NEVER OFF- Automatically switches between superlative noise canceling or optimized ambient sound for listening without distractions. Sony's best transparent ambient sound in truly wireless headphones (As of May 9th 2022. Excluding Open style.) ULTRA SMALL & LIGHT- These bluetooth earbuds fit comfortably in your ear. IMMERSIVE SOUND QUALITY- With the Integrated Processor V1. ULTRA-CLEAR CALL QUALITY- Advanced Voice Signal Processing lets sound come in clear. Sony's best ever call quality in truly wireless headphones (As of May 19th 2022). MULTIPOINT CONNECTION- Connect two devices at once (Available via firmware update) LONG BATTERY LIFE & QUICK CHARGING: Up to 6 hours of battery life and up to 20 hours with charging case. Quick charging gives up to 60 minutes of playback with a 5 minute charge. IPX4 RATING-Protects against sweat and splashes on these wireless ear buds. TOUCH CONTROLS- Pause, play, skip tracks, control volume, activate your voice assistant, and answer phone calls on these bluetooth headphones. ALEXA BUILT-IN- These noise cancelling headphones are Alexa enabled for voice access to music, information, and more. Activate with a simple touch.