Whether practicing on the range or laying poolside, enjoy the rhythmic sounds of music without the hassle of external cords or earbuds with the Callaway Smart Glasses. With speakers built right into the frame, these sunglasses will sync with any Bluetooth enabled device to deliver music or receive phone calls wirelessly. Our innovative P2X polarized lens technology was designed specifically for golf, reducing glare and better managing light for enhanced depth perception to maximize your ability to read greens, make more putts and lower your scores! Along with an 8-Base lens configuration design which provides maximum eye coverage, our special lenses provide maximum protection against harmful UVA, UVB and UVC rays. The rechargeable lithium battery lasts 8 - 10 hours on a full charge. Includes lens cloth, soft carry pouch and hard case with hanging clip.