The Jabra Elite Sport New 4.5H True Wireless Earphones offer superior sound and call quality thanks to its four advanced microphones to make sure you hear exactly what you want to. Up to 4.5 hours of play on a single charge, and up to a total of 13.5 hours of battery life with the use of the charging case Most technically advanced true wireless sports earbuds Superior quality sound for calls and music Comfortable and secure cord-free fit Personalized fitness analysis and in-ear audio coaching Compatible with Apple iOS and Android smartphones Water and sweat proof Lose the Cord Thanks to customisable fitting options the Jabra Elite Sport New 4.5H True Wireless Earphones will stay in place no matter how hard your workouts are. Whether you want to wear one, or both, of the headphones you can rest easy knowing you will always have a comfortable fit that is truly secure. Stay Alert With Hear Through technology you can quickly become aware of your surroundings. Hear Through will filter the sounds that surround you so you can always be aware of what is going on around you. Achieve Your Fitness Goals Using the Jabra Sport Life app, you can make the most out of every workout. By monitoring your heart rate, reps, target pace and a ton of other specs you will be able to easily monitor your progress. The in-ear audio coaching will assist you in real time, being that voice in your head pushing to get that extra rep!