Main Features• Novelty appearance design, super light and durable shell• In the process of welding, the object has high definition and can observe the solder joints very clearly so as to ensure the welding quality• Advanced double filter technology, uniform light transmission, clear image, avoiding harmful radiation from UV / IR or strong light damage to glass• When not photosensitive, light shield number is three, providing adequate light for ready work and accurate polishingSpecification• Light shade: DIN4• Dark shade: DIN - 13 adjustable outside• Lens size: 93 x 43 x 6mm• Cartridge size: 110 x 90mm• Response time: less than 1/25000s ( from bright to dark )• Release time: 0.155 - 0.80s adjustable ( from dark to bright )• Switching time: 1/10000s• Sensitivity: low / high ( welding time according to magnitude of current )• Power supply: rechargeable Li-ion / solar battery ( included )• UVT transmission: 313nm ( 0.003 percent and less ) 365nm ( 0.009 percent and less )• UV protection: class 15• Infra red transmission: 780 - 1300nm ( 0.003 percent and less ) 1300 - 2000nm ( 0.009 percent and less )• Work temperature: -5 - 55 Deg.C ( 23 - 131 Deg.F )• Store temperature: -20 - 70 Deg.C ( -4 - 158 Deg.F )• Application range: electric, argon arc, gas welding, soldering and all except laser weldingPackage weight: 0.572 kgProduct size (L x W x H): 30.00 x 23.00 x 22.00 cm / 11.81 x 9.06 x 8.66 inchesPackage size (L x W x H): 35.00 x 24.00 x 23.00 cm / 13.78 x 9.45 x 9.06 inchesPackage Contents: 1 x Welding Helmet, 1 x Headband, 1 x English Manual