The k3-a bluetooth headset sunglasses perfectly combines polarized sunglasses with headset. the k3-a bluetooth headset sunglasses uses bluetooth 4.1 technology supports super-fast data transmission and has perfect compatibility, easy to pair with bluetooth-enabled audio player, offering you wonderful music. k3-a is equipped with high-performance microphone and supports hands-free function, bringing you much convenience to answer the incoming call during driving & travel. k3-a bluetooth headset sunglasses is an indispensable companion for outdoor activities, such as cycling, fishing, travelling, climbing, golfing, etc. features: k3 bluetooth headset sunglasses perfectly combines polarized sunglasses with bluetooth 4.1 headset. polarized eyeglass, providing protection to reduce glare, filter light and protect your eyesight. fashionable glasses frame, uses high-grade materials, lightweight, flexible and durable. compatible with bluetooth-enabled android and ios smart phones, such as, for