Open-Ear Comfort Our open-ear design, powered by bone conduction technology, allows for total awareness of surroundings and bud-free, comfortable listening. Available in 2 sizes to maximize comfort and ensure a secure fit. OpenRun Mini has a 0.83 inch shorter band size. IP67 Waterproof An IP67 rating makes these completely sweat and waterproof to welcome intense workouts and extreme weather. A moisture detection alert ensures safe charging. Not intended for swimming. Outstanding Sound Quality Powered by patented 8th generation bone conduction, Bluetooth 5.1, and PremiumPitch™ 2.0+, OpenRun delivers clear sound, powerful volume, and a rich bass. lightweight Secure Fit Meet your new favorite training partner. Designed for athletes, our wireless headphones stay put for all-day listening while keeping you motivated and aware of your surroundings. 8-Hour Battery Life Quick Charge With 8 hours of battery life and easy commands such as play, skip, pause, and back-a-track, you can enjoy music, calls, audiobooks, and podcasts all day long. OpenRun also features a 10-minute Quick Charge for up to 1.5 hours of battery life. This data is gathered at the Shokz laboratory and is tested by playing ACC encoded audio at 75% volume on iOS14 mobile devices. The actual battery life will be affected by the type of audio, volume, temperature of your environment, and output of the USB port used to charge your headphones. Sized Down For A Snug Fit Big performance in a smaller size. OpenRun Mini features a comfortable 0.83-inch shorter band than our Standard size, making it ideal for smaller head sizes and for those who prefer a more snug fit.