The JBL Under Armour True Wireless Flash In-Ear Headphones offers a truly cord-free experience and are designed for exercise and sports. While these headphones will work in almost any situation, they are ideal for runners due to Under Armours Stormproof IPX7 water-resistant technology. Additionally, three different pairs of eartips and stabilizers are meant to keep the earphones locked-in and stable during your workout. The built-in rechargeable batteries last up to 5 hours per charge while the rugged aluminum carrying charging case, with a bu