Advanced wireless connectivity and superior quality calls and music Waterproof design and 3-year warranty against sweat (registration via Jabra Sport life app required) 4.5 hours Talk/music time in earbuds. Charging case adds additional 9 hours of battery life. Comfortable and secure cord-free fit, with option to wear One or both earbuds.In-Ear precision heart rate monitor and fitness analyzer. Personalized in-ear audio coaching, race pace Calculator and recovery advice. 3 sizes of EarWings (S, M, L) NOTE: Kindly refer the Instructional Video from the Image Section and User Manual from the Technical Specification before use which is highly recommended..