Technical Data: Viewing Size: 90 X 40mm Dimension: 335 x 220 x 220mm Shade Control: light States: din4 Dark States: din9-13internal Adjustment Switching Time: light-dark: 1/25000sec(0.04ms) Delay Time: dark-light:0.2-0.3sec Uv/ir Protection: up To Shade Din 16 At All Time Operating Temperature-10cto+70c(14fti 158f) Power Supply Solar Cells Batteries,two Aaa Batteries Lens Power Control: auto On ,auto-off After 15-20minutes Of Idle Time Battery Indicator: normal Led& Low Battled Standards:ce: en379:2003;en169:2002;en175:1997 Helmet Material: pp(fireproofing)