Features: 1. This Welding Lens Filter can shade automatically in welding states and filter out the bad light. 2. With solar charge function and full automatic ON/OFF, very convenient and efficient. 3. High clear view filter: Using high quality LCD and multilayer optical interference filter. 4. You will get a good eye protection with it at working and prevent occupational disease. 5. It fits all standard welding helmet window opening. Specification: Filter size: 108*51.5*5.5mm / 4.25*2.03*0.22in Viewing area: 91.5*34mm / 3.6*1.34in Light shade: DIN3.5 Dark shade: DIN11 Switching time: 4/10000S Delay time: 0.2S Power supply: Solar powered / lithium battery (battery is not replaceable) Lithium battery capacity: 60mAh Operating temperature: -10~65℃ Sensors to weld arc: 2pcs Mask material: PA/PP Protection grade against IR/UV rays : DIN15 Package List: 1 * Welding Helmet Lens Filter