These glasses look like an ordinary pair of sun glasses. Yet they have a  unique feature...you can see behind you. The lenses on these glasses  have a special coating that allows you to look straight ahead and still  see what is going on behind you. Stylish and great for walking and  biking. You won't need to turn your head to see if a car is coming.  It'll be like you have a rear view mirror with you. Have you ever  thought you were being followed? Now, no one can sneak up behind you.  These sun glasses make a great novelty gift!

 

high-tech coating Glasses lens, the wearer may not have to go back we can found tracker  from the corner of the eye , angle 18 degrees, such as the short  distance, even the track's appearance can be seen clearly. This product  can be used for other purposes, such as the public security organs  monitor criminal suspects, the wearing of the glasses can significantly  increase the hidden nature of the monitor, reduce the possibility of  criminal suspects.
General sunglasses

Special gadgets for view backside people

Special and cool gadgets for fun

special gadgets for people at your backside

special gadgets sunglass black color