The Crystal noise-canceling wireless earbuds feature a powerful Bluetooth chip for stable signals and crystal-clear sound. These earphones offer seamless auto connection connecting instantly when the earbuds are removed from the charging case. Earbuds offer Fast charging in Just 10 minutes of charging gives you 3.5 hours of use. With a full charge, enjoy four hours of playback and up to 30 hours with the portable charging case for uninterrupted music enjoyment on the go.