Tips: These glasses allows you to see whatever behind you as a rearview mirror while protecting your eyes from sunburn. The design is fashion, so it is great for walking, biking, sunbathe in the beach and many other outdoor sports. Using the reflect mirror principle, you can have a glance at a small angle to see the things behind you with this anti-following up sunglasses, you will easy notice who are following up you.----1. Designed for anti-tracking 2. Breaking all the rules of tracking 3. No need to turn around to see who is following you 4. Side mirror view on both sides design, just works like the rearview mirror in your car5. Protection against ultraviolet rays 6. Protect yourself from would be stalkers 7. Great way to keep your distance and seek assistance 8. Don't have to sneak up behind the suspects anymore, walk ahead of them 9. Fashion and stable design----Parameters: 1. Lens Width: 55mm 2. Lens Height: 35mm 3. Glasses Width: 135 mm 4. Glasses Left and Right Length: 14mm 5. Net Weight: 20g 6. Color: As you can see in the pictures.----Package Content: 1 x Rearview Glasses