Aug 27
This is a very unique sunglasses. It’s look very much like an ordinary stylish designer sunglasses, but with a special twist. Wearing these spyglasses, you’ll be able to look behind you. The spyglasses’ special coating allows you to see straight ahead while still be able to monitor what’s happening behind you. Just like have a pair of portable side rear view mirror.
The usage is limitless; perfect for biking and very useful for walking. If you happen to be a driver, perhaps you can use the sunglasses to “monitor” what’s “happening” on the back seat 
Just be careful with the traffic 
Spy sunglasses, available at the Gadget-Box.