The Callaway Golf Smart Glasses have it all! Bluetooth, WiFi, cell service, music, you name it. You can't find these types of sunglasses just anywhere! The Callaway Golf Smart Glasses are not only sleek and stylish for the course, but they're tech savvy, making your round of golf more enjoyable! Whether you can't catch a break and have to answer business calls or want to pump up your game with today's hot music hits, it can all be done when you bring these to the greens! They come with both single and double earbud options to fit your personal preferences. Battery lasts from 8 to 10 hours! Perfect amount to get a round of 18 in (or two)!