JBL Pure Bass Sound With bold sound and rich bass from a 6mm dynamic driver, you won't just hear the music-you'll feel it. Up to 30 hours of battery life Never miss a beat with 10 hours of battery life from the earbuds and 20 hours from the case. Need a boost? Just 10 minutes of Speed Charge gives you another full hour of playtime. Enhancer and Twistlock design support your active lifestyle The ergonomic wing enhancer of JBL's Endurance Race uses Twistlock technology to alleviate pressure point discomfort, giving you a better seal and stability for a superior all-day fit.