1. Custom sound experience Keep your adventures clear and undistorted with music, and adjust your equalizer settings in the Jaybird app. 2. Born for adventure The fully weatherproof IPX7 architecture makes it easy to handle a variety of bad conditions and adventures. 3. Light and comfortable Your ears, your headphones. The replaceable ear flaps and earmuffs are easy to adjust and fit comfortably. 4. All weather durability The battery that supports fast charging can support 8 hours of continuous use, and has the same endurance as you.