Happy New Year! (Short for "Akemashite Omedetou Gozaimasu" and "Kotoshi mo Yoroshiku Onegaishimasu") 【40-Hour Long Battery Life】Up to 9 hours of playback on a full charge, and up to 40 hours with the charging case. 【Gentle on the Ears】Extremely lightweight at approximately 3.8g per earbud. Ergonomically designed based on analysis and over 300,000 ear canal feature analyses for a better fit. 【Quick Charging: Up to 3 hours of music playback with approximately 10 minutes of charging】A quick 10-minute charge before leaving the house provides up to 3 hours of music playback. 【IP54 Dustproof and Waterproof】IP54 dustproof and waterproof design allows for comfortable use even during outdoor workouts. 【Stable Bluetooth 5.3 Connection】A more stable Bluetooth 5.3 connection reduces audio delay, minimizes screen and audio lag, and allows for a more immersive entertainment experience.