Zoook Rocker Sprinter Bluetooth Headphones -Better technology, Not only make the best sounds, but create more various way of hearing why Zoook Sport Headphones? 1. IPX5 sweat proof rating, Zoook Bluetooth earbuds keeps your earphones protected and in peak condition whether you’re getting drenched in sweat after a grueling workout. Perfectly for running and working out, 2. Unique 10mm large-aperture drivers and CSR chip, Zoook running headphones features stereo sound with high definition and unparalleled rock-solid bass. Let your favorite songs drive you forward. 3. Head-mounted ergonomically and elastic wire design, secure fit without hurting your ear, enables comfortable and firm wearing experience. 4. Built in battery, enjoy about up to 8 hours of premium quality talk/play time. Kind note: Please keep your headphone charged when in low battery life to achieve better Bluetooth connection and protect your battery.