With the Endurance SPRINT Waterproof Wireless In-Ear Headphones from JBL, you can stream audio from a Bluetooth-compatible mobile device for your entire workout. The built-in battery provides up to 8 full hours of your favorite audio per charge. If you're in a rush and forgot to charge your SPRINTs, don't worry, because with just 10 minutes of charging, you'll get enough power for an hour of audio.