Sunglasses with built-in Bose speakers that produce rich, immersive sound for you, while others hear nothing Open-ear audio allows you to stay aware of your surroundings, while enjoying your music Bose frames alto feature a classic angular shape and commanding lenses in 2 sizes. Bose Frames S/M lens width: 53 millimeter, bridge width: 20 millimeter, temple length: 135 millimeter Integrated microphone for clear calls and access to your phone's virtual assistant Personalized settings, access to future updates, and more available through the Bose Connect app. Bluetooth connectivity for easy pairing Battery life: 3.5 hours streaming; 12 hours on standby. Charge time: 2 hours