Servore Auto Shade Darkening Welding Goggle Arc-513 Arc513 World's First Tig The color of the product will be sent by random. Goggle products do not come with auto power on function. This button is to turn on the power. Shade level can be adjusted in 5 levels from #5 to #13 according to welding type and current. The product has been designed to be used for grinding purpose with #4 shade of darkness for goggle