Do you have a secret mission coming up? Still looking for a way to spy on your brother, sister or secret crush? Well, these Spy Glasses are just what you need! These Spy Glasses will allow you to see behind you because there are mirrors on the inside of the lenses. This way, you can sit facing away whoever you are spying on, but still be able to watch what you are doing. These are perfect for a CSI party or a gag gift for your friend.