K2, as the secondly blut-tooth glasses, aprart from all function in K1, more humanized voice controlling technology is added; when you're going out by car, it achieves convenient and fast function like receiving phonecalls, sending messages and searching datas using K2's voice controlling system; during hiking journey, you can enjoy not only WIFI music but also searching scenery information by voice; When playing golf, you can make phonecalls, sending messages, seaching and resisting strong light; when going fishing or climbing moutains you won't worry about vague lake surface, you can also searching for weather and other relevant information.It makes you fell relaxed about your life! Features: Core technologies: voice control (call, send text messages, notes remind, query data, computer features) Smart touch, easy to operateVoice navigation, music broadcastResist glare (TCL polarizer for car owners, bikers and fishing family, explosion-proof lenses can withstand high impact) Comfortable adjustment (adjusting nose pads, replacement lenses)