**Product Specifications:**
**Brand:** Bertha
**Product Name:** Titanium Lightweight Tough Sunglasses
**Features:**
- Memory titanium smart photochromic lenses
- LIGHT & TOUGH SUNGLASSES
- Modern and cool design
- Sun protection and glare reduction after color change
- Clear vision before color change
- Lightweight titanium material for floating feel and zero burden
- Even and long-lasting photochromic color change
- CO protection for glare reduction and clear vision
- UV protection with polarized lenses
**Functionality Testing:**
- Photochromic effect test: Cover half of the lens with a cloth, then remove the cloth to observe color change after exposure to sunlight for about 15 seconds
- Polarized/UV400 effect test: UV400 test passed, showing effective UV protection and polarization
**Lens Color Selection:**
- Lens color depth affects visible light absorption, not UV protection
- Choose darker lenses for intense sunlight and lighter lenses based on personal preference
**Bertha Polarized Lenses:**
- Zero-degree polarization to prevent dizziness and eye strain
- Ideal for driving with improved clarity, reduced glare, and UV protection
**Design Details:**
- Titanium alloy memory legs for flexible and comfortable fit
- 130° adjustable angle for adaptive fit on different face shapes
- Durable hinge design for smooth opening and closing
- Soft silicone nose pads for comfortable wear without red marks
- Ergonomic anti-slip design for secure and snug fit
**Frame and Lens Details:**
- Silver frame with black-gray lenses
- Detailed showcase of design and functionality
**Additional Testing and Verification:**
- Functional tests for color change, polarization, and UV protection
**Miscellaneous:**
- High-definition clear vision with unique design and quality assurance
(Note: The specifications have been summarized and organized based on the provided information.)
