Solar cells helmet(welding helmet, welding products) Features for Solar cells helmet : 1) Uses high quality LCD and multilayer optical interference ... supply by solar cells, no battery change required 3) Made of nylon 801, strong and welding spatter safe 4) Standard auto-darkening filter ... Time form dark to light : 0.1-0.5s · Power : Solar cells · Operation temperature : -10C°-55C°(14F°-131F°)