These spy glasses look like an ordinary pair of sunglasses. Yet they have a unique feature...you can see behind you. The lenses on these spy glasses have a special features that allows you to look straight ahead and still see what is happening on behind you. 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 spy sun glasses make a great gift!