1. Double convex lens, high definition, improve reading comfort
2. Lightweight design, not tired of holding it for a long time
3. Can be used to magnify the image of objects, jewelry viewing, learning, reading, etc., easy to carry
4. Magnification: 3 times
5. Material: PS
6. Single weight: 40mm: about 8g; 28mm: about 4g
7. Single size: 40mm: about 9 x 4cm; 28mm: about 5.8 x 2.8cm