Randolph Engineering Sportsman Matte Black Sunglasses | Tan Polarized Skull Size:57MM - SP72432 It has the chronograph function

It has the chronograph function as well as blue illumination independent of a battery or charging by sunlight

Model HX1837 BKWV

patented matte finish poly-resin A 2R case

Water Resistant: 330 ft / 145 psi

Neptune attaches securely to goggle straps and rests on the cheekbones as to not interfere with swimming technique

Randolph Engineering Sportsman Matte Black Sunglasses | Tan Polarized Skull Size:57MM - SP72432 It has the chronograph functionRandolph Engineering designed the Sportsman Sunglasses for the outdoor enthusiast, with an extremely durable frame that handles harsh conditions in high style. [Details] Made in USA using the finest components found worldwide. Lifetime warranted solder joints Sweat bar for ultimate comfort and a luxurious look Adjustable silicon nose pads for customized fit Mineral crown glass lenses 98 100% UV Protection Package includes a case, microfiber cleaning