I purchased them and never used them. 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 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. 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.