Enjoy up to 8 hours of listening with these Jaybird X3 wireless earphones. Their Bluetooth connectivity syncs with the MySound app to create custom sound profiles, and they're sweat-proof for use during intense workouts. These Jaybird X3 wireless earphones are 34 percent smaller than the previous X2 model for comfort even under a helmet.
The voice prompts, such as "power on", "connected", "power 60%" are, literally, painfully loud and their volume cannot be adjusted. Despite their fidelity and the nifty app that allows one to adjust the frequency response, this one issue caused me to return the earphones.