Value-packed, 100% wire-free workout 'phones I can't stress how much I appreciate truly wireless earbuds during workouts ? there's no cable to get in your way or to get caught on gym equipment. And the sweat-proof JBL Endurance PEAK earbuds are designed to fit securely and comfortably while you move. Music plays wirelessly from your phone via Bluetooth. An around-the-ear hook stablizes each earbud, while JBL's patented TwistLock system secures them in your ear. You put each earpiece in and twist. You'll spend more time working out and less time having to adjust your headphones. Strong sound for motivational music JBL has fine-tuned their sound signature to please the most amount of people ? from their so-called "entry-level" headphones on up. We've visited their parent company, Harmon, and you wouldn't believe the amount of research that goes into honing their acoustics. I haven't heard these particular earbuds, but as a whole, JBL headphones deliver a satisfying, mids-focused sound. They tune their headphones to deliver clear vocals and hard-hitting bass. Those are two sound traits that can really help push you to run or exercise just a little bit more. Extra-soft and sweat-proof to survive the toughest training JBL's specially made ear tips feel soft and comfortable for your entire workout ? no matter how long you go. You get three different-sized flexible silicone 'buds, so you can find the right fit. They're designed to avoid nerves and pressure points inside the ear that cause pain or discomfort. And these earbuds can handle sweat and rain ? in fact, they're IPX7-rated waterproof. So you can keep the music going when you're hitting a grueling trail outdoors. A carrying case that recharges your earbuds wirelessly The JBL Endurance PEAK earbuds offer up to four hours of on-the-go music listening on a full charge. When it's time to refuel, you just click them into the included charging carrying case. This pocket-sized case can bank up to 24 hours of power to recharge your earbuds. 10 minutes inside the case gives you an hour of wireless use. Product highlights: 100% wire-free headphones no connecting cord between left and right earbuds Bluetooth 4.2 for wireless music listening and phone calls touch control for Bluetooth pairing, music playback, and calls 10mm dynamic drivers tuned for energetic sound Designed for running and workouts: IPX7-rated waterproof design flexible "Powerhook?" ear hook design secures earbuds while exercising patented TwistLock system keeps earpieces from moving or falling out during workouts FlexSoft silicone ear tips are designed to avoid pressure points and stay comfortable includes 3 sizes of ear tips for a customized fit 1 pair of winged ear tip enhancers to help keep earbuds in place Charging Case and Battery Information: built-in rechargeable batteries offers 4 hours of listening carrying case banks up to 24 hours of power to wirelessly recharge headphones 10 minutes inside case provides enough power for 1 hour of listening USB cable included for charging case General Info and Specs: Call Mode makes wireless phone conversations sound more natural automatically switches to mono sound for phone calls frequency response: 16-22,000 Hz What's in the box: Left and right true wireless earphones (black/white) Charging case (black) 3 Pairs of ear tips (1 pair installed) Pair of enhancers (installed) 10" USB charging cable (Type A USB on one end and Micro-B USB on other end) Quick Start Guide Warranty Guide FCC/IC Statement Safety Guide JBL Endurance PEAK Waterproof Bluetooth Wireless In-Ear Sport Headphones, Black.