High-comfort wireless earphones stay nice and snug while running, working out and more with durable, soft rubberized hanger clips and quick-fit adjuster for a personalized fit. Inline mic/controller instantly adjusts voice and music volume, changes tracks and switches seamlessly between phone and tunes. Compact, rechargeable battery provides over four hours of playback when fully charged. Run, exercise and more to the high-quality sound of natural trebles and rich, resonating bass with powerful, premium 14.3mm neodymium drivers and the enhanced wireless clarity of Bluetooth 4.1. With enhanced Bluetooth 4.1, these wings wireless earphones easily pair with all your Bluetooth devices. After their initial syncing, your devices connect automatically when the BTS10 is switched on. Powerful 14.3mm neodymium drivers keep the beat with high-end treble and Deep, resonating bass. For safety while exercising, ambient sound is not fully blocked by the BTS10 to let you hear and adapt to your surroundings, with minimal effect on your music. When your battery is low and you're headed to the gym, a single 20-minute quick charge gets you up and running with power for 60 minutes of clear, dynamic sound.