Smith Optics Purist Polarized Sunglasses-Black/Polarized Gray Automatic Wireless sensor that uses a

Wireless sensor that uses a Global Positioning System to track speed & distance across wide variety of outdoor activities

Dual Fuel means it runs on the included SF18650 rechargeable lithium-ion cell or on two 123A lithium primaries

Lens Material Optical-grade glass lens

Just use your thumb to push outward on the recess and rotate the blade into place—with no protruding thumb stud or flipper in the way

the C20C generates up to 450 lumens output with an effective range of 139 meters

Smith Optics Purist Polarized Sunglasses-Black/Polarized Gray Automatic Wireless sensor that uses aDiminutive in stature but strong in performance and style, the Purist offers delicate surfacing and a rounded, rectangular lens profile in a stylish, 8 base wrap for smaller faces. Auto lock hinges and megol nose pads offer an unbelievably comfortable fit, while our Carbonic lenses provide superior impact protection and 100% protection from the sun's harmful rays. The Purist is a perfect piece for those always on the go.