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You can control the tint on these smart-sunglasses using a slider on a smartphone app - Yanko Design
Walmart Ashland City - ZEISS Velocity self-tinting lenses quickly adapt to changing light conditions, providing clear vision indoors and protection against harmful UV light when out. Available in Extra Gray, Gray, Brown,
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Rapid Eyewear Nimbus Self-Tinting Sunglasses for Men and Women Sports Glasses with Phototrope Lenses for Driving, Running, Biking, MTB etc. UV400 Safety Glasses : Amazon.de: Sports & Outdoors
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You can control the tint on these smart-sunglasses using a slider on a smartphone app - Yanko Design
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