These handsome designer sunglasses are a great surveillance aid since you can look straight ahead but see behind you! It's as if you have a built-in rear vision covert mirror! With them, no one can sneak up behind you. Aside from covert surveillance and investigative use, they are also great for walking and biking since you can see cars behind you without turning your head. They make great gifts for investigators and cops who simply love them! These are high quality designer surveillance sunglasses that come in an attractive and expensive looking case. The very best rear-vision surveillance sunglasses made.