Endurance%20Sprint%20Wireless%20Bluetooth%20Earbuds%20-%20BlackUp%20to%208%20Hours%20of%20Listening%20Time%3B%20Comfortable%20FlexSoft%20Ear%20Tips%3B%20IPX7%20Waterproof%3B%20Built-in%20MicrophoneUp%20to%208%20Hours%20of%20Listening%20TimeComfortable%20FlexSoft%20Ear%20TipsIPX7%20WaterproofBuilt-in%20MicrophoneWith%20the%20Endurance%20SPRINT%20Waterproof%20Wireless%20In-Ear%20Headphones%20from%20JBL%2C%20you%20can%20stream%20audio%20from%20a%20Bluetooth-compatible%20mobile%20device%20for%20your%20entire%20workout.%20The%20built-in%20battery%20provides%20up%20to%208%20full%20hours%20of%20your%20favorite%20audio%20per%20charge.%20If%20you’re%20in%20a%20rush%20and%20forgot%20to%20charge%20your%20SPRINTs%2C%20don’t%20worry%2C%20because%20with%20just%2010%20minutes%20of%20charging%2C%20you’ll%20get%20enough%20power%20for%20an%20hour%20of%20audio.