Rock on and recharge with the Phaz Model P2 headphone-battery combo

LAS VEGAS—Phāz Music, a brand-new audio company that launched Tuesday, has introduced its first product: The Model P2 headphones. The over-ear P2s are cool-looking, with their carbon fiber frame and bright-orange ear cups, but looks aren’t what makes these headphones special. The P2s are the first headphones that double as—get this—a portable battery pack for your smartphone.