JBL Endurance Zone TWS Open-Ear Sport HeadphoneJBL OpenSound technology Enjoy clear, exciting music buds free, so you can always hear your surroundings while you exercise. A sensitive 18x11mm dynamic driver delivers crisp, clear highs and round, rich mids, while our adaptive bass boost algorithm provides the beat that keeps you moving. The precise fit and directional sound of your JBL Endurance Zone earbuds ensures minimal sound leakage. So even if you have to take a call at the gym, your