JBL Endurance Race Black earbuds provide the best sound and bass experience with a 6mm dynamic driver. Enjoy up to 30 hours of life with 10 hours from the earbuds and 20 hours from the case and a quick 10-minute Speed Charge for an extra hour. Featuring a TwistLock design and wing enhancer for all-day comfort and IP67-certified dust and waterproof design, you can stay active and energized where ever you go.