The Spy Specs look like an ordinary pair of sunglasses. Yet they have a unique feature... you can see behind you! The lenses on these sunglass-style specs have a special reflective coating that allows you to look straight ahead, yet see behind you as if you had a rear view mirror. When you put them on, look out of the corners of your eyes and you'll see what's going on - and no one will ever know you're watching them.
Have you ever thought you were being followed? You won't need to turn your head to see what's coming up behind you.