Made the way a sports headphone should be. No pain, no gain not with your headphones. Relays sport wireless revolutionary fit with free flex technology is effortless to use without complicated twisting locks and hooks that irritate your ear over time. And with its noise isolating in-ear tips, youll hear the full sound and emotion of your music that will help you run faster and train harder. Youll love them more than your favorite pair of shoes. This is one of the most advanced Bluetooth sports headphones with up to 8 hours of playtime, full range high fidelity sound, microphone, music controls, sweat and water resistance, and a special outdoor sound mode. Youll hear powerful, full sound with high energy Deep bass and clear vocals that bring out the emotion in your music. Outdoor sound mode increases the bass thats hard to hear when running outdoors.