Open ear design keeps you aware of your surroundings while delivering clear quality sound, making it ideal for runners and outdoor athletes who prioritize safety Up to 36 hours of total battery life with 11 hours per charge plus 25 hours from the case, and fast charging that provides 90 minutes of playback in just 5 minutes Personalized sound customization through the beyerdynamic app allows you to tailor audio to your workout style for a more motivating listening experience Intuitive touch controls make it easy to manage music and calls without interrupting your run or training session Lightweight secure fit with premium materials and IP54 weather resistance ensures long lasting comfort and durability in various outdoor conditions