Application: DRIVING GIFTING Driving,boating,biking,golfing,fishing,skiing,mountaine SUNGLASSES With Bluetooth headset ... (cell phone have mp3 function ), SKYPE chatting3. with Inner layer for short sight or presbyopic lenses4.120 hours standby time, up ... to 6 hours talking time5. with 3 legs, easy for changing when charging Bluetooth headset legTAC Polarized lens : high definition ...