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Built-In Rechargeable Battery Up to 5 Hours of Playback Charging Case Delivers 20 Hours of Power Stormproof IPX7 Dust Water Resistance Talk-Thru for Clearer Conversations Let the World in with Ambient Aware Wireless Bluetooth Technology Controls on Earbuds for Calls Playback JBL Charged Sound for Deep Bass Eartips Winged Ear Enhancers Included. Designed for exercise and sports the Under Armour True Wireless Flash In-Ear Headphones from JBL give you a truly wireless method of enjoying your favorite audio while you work out. While these headphones will work in almost any situation they are ideal for runners due to Under Armour’s 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. When listening to your favorite audio you’ll enjoy the fact that the built-in rechargeable batteries will last up to 5 hours per charge. Even better the rugged aluminum carrying case is also a charging case with a built-in battery that gives the True Wireless Flash headphones four additional recharges for 20 more hours of playback. JBL’s Charged Sound technology takes your workout jams and tunes them to get you motivated delivering deep and rich bass. When you need access to the outside work simply activate JBL’s Bionic Hearing technologies with a tap.