Auto-Darkening Welding Helmet Lithium Battery Powered with Solar Backup Filter Dimension: 110 x 90 x 8.5mm View Size: 92 x 42mm Light states: Shade DIN 4 Dark states: DIN9~13 free adjustable Response time(bright to dark): (1/30000 seconds (normal temperature conditions) The turn time: (dark to bright): adjustable: 0.15s ~0.8s Sensitivity Control: Adjustable Power: Lithium Batteries + Solar Panel Working temperature: -5°C ~ 55°C (23°F ~ 131°F) Storage temperature: -20°C ~ 70°C (-4°F ~ 158°F) Includes: 1 Auto-Darkening Welding Helmet 1 User Manual