Relays Sport WirelessDesigned for comfort, engineered for soundNo pain, no gain? Not with your headphones. Relays Sport Wireless revolutionary fit with FreeFlex 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, you'll hear the full sound and emotion of your music that will help you run faster and train harder. You'll 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, quick charge technology, microphone, music controls, sweat and water resistance, and a special outdoor sound mode.No pain, no gain? Not with your headphones. Relays Sport Wireless revolutionary fit with FreeFlex 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, you'll hear the full sound and emotion o