PRISTINE TECH #1 NEW SMART GLASSES Wireless Bluetooth 4.0 Stereo Polarized Glasses, Hand-free Phone Answer/Call Music Function All Outdoor Activities (Black) SMART SUNGLASSES is a sport wireless bluetooth sunglasses, adopted British CSR4.0 + EDR chip, it can improve the bluetooth data transmission, at the same time it can connect several bluetooth equipment. ADVANCED STEREO + CVC 6.0 de-noising technology can block outside noise, prevent auditory fatigue, whether it is in motion, walking or driving EXPLOSION-PROOF POLARIZED LENS and has strong resistance to impact and permanent,which is one of the world's best lenses, Can protect the eye efficiency when hit accidently. HEADSET MAGNETIC ABSORBTION DESIGN; Bluetooth connecting two mobile phone/digital devices at the same time; A key voice and music; shake motor prompt function;Voice call/answer the phone BUILT-IN RECHARGEABLE LITHIUM ION BATTERIES, cooperate with double power management chip, standby can be up to 10 days, call time is 8-9h and music time is 8-9h.