Description: The helmet type secures firmly to the head, so you can focus on welding work without blocking both hands. Automatically blocks harmful light from the eyes during welding, and the sensor detects the welding light automatically. It is compatible with arc, TIG, and semi-automatic welding, so it can be used on automotive sheet metal, construction sites, etc. The use of solar batteries means that there is no need to change batteries frequently. Product Specifications: Field of View: 3.6 x 1.7 inches (92 x 4Number of arc sensors: 2 Perspective light shielding degree: DIN 4 Light shielding range: DIN9-13 UV / IR Transmittance: DIN 16 Shading Speed: 1/15,000 seconds Switch Speed: 0.25 - 0.45 seconds. Auto: blackout function, power on/off, sensitivity adjustment Power supply: Solar battery Operating Temperature: -5°C - 55°C Storage Temperature: -4°F to 154°F (-20°C to 70°C). Weight: 15.7 oz (450 Accessories: 1 outer lens, 1 inner lens.