Bluetooth 5.1 and Stereo Sound Quality: Adopting latest Bluetooth 5.1 technology, CSR chip and superior acoustic component, bluetooth headphones ensures faster and more stable connection. Powered by powerful 11mm dynamic driver and in-ear acoustic structure, wireless headphones delivers fantastic sound beside your ear. Retaining more details of sound and providing CD-level stunning stereo and punchy bass experience for you.^ IPX7 Waterproof: Rain, sweat, and water splashes all happen, so be ready with waterproof earbuds, which are rated at IPX7 to withstand liquids during strenuous exercise and all-weather conditions.^ Up to 10 Hours of Playtime: Equipped with improved polymer lithium battery, wireless headphones allow for all day listening. It only takes 2 hours to be fully charged and a single charge will deliver 10 hours of superior audio performance / talk time. And the remaining battery power can be displayed on the device screen. (Note: Please use the charging cable comes with it)^ Ergonomic Design for Sports: Special slanting-shape together with ear hooks ensure the earbuds stay comfortably firm in place when doing sports, running or doing other extreme sports. Equipped with 4 pairs of ear caps to ensure your headphones fit comfortably and noise cancelling in ear. Just move as you want.^ Perfect to Make Phone Calls: Bluetooth headphones introduce noise cancellation microphone to better filter out environmental noise and pick up your voice, ensure people can hear each other clearly and loudly on the phone.