PC frame and impact AC lenses with UV protection and scratch resistance.
Built-in Ultra bright LED lights improve vision in the dark.
Requires 4 button cell batteries (included) which can last for up to 30 hours of continuous use.
Lenses material: acrylic plastic.
This plastic has excellent optical qualities, good chemical resistance and thermal and electrical properties and has moderate strength.
Diopter available: +1.0; +1.5 ;+2.0 ;+2.5 ;+3.0；+3.5；+4.0.