【The Lightest Bone Conduction Glasses】: Lighter and more professional. The Frame is made of TR90 plastic,smooth and hiden structure design of bone coduction speaker helps it keeps the original appearance of traditional glasses, people around you will not notice the difference of your glasses between traditional glasses. No pain and no sens of pressure even wearing for a long time. 【BLUETOOTH VERSION 4.1 WITH MIC & CVC Noise Reduction】 Wireless Bluetooth 4.1with wide compatibility. 2 in 1 wireless connection allows 2 mobile device pairings into the headset simultaneously.The smart sunglasses has built-in noise-cancelling microphone that lets you make and answer phone calls. You can easily have phone calls with quality sound when riding, running, driving, boxing, fishing, playing the basketball, shopping and other outdoor activities. 【OPEN EAR SOLUTION】Open Ear Solution allows you to listen to music, answer calls, and hear notifications all from your glasses while still being able to hear the world around you.