External and internal shade, sensitivity, delay time and grinding mode controlsFully compliant with current safety and technical standards Product features SKU JEFWELHT4G Optical Class 1/2/1/2 Function Modes Welding & Grinding Operating Temperature Range -5?C to 55?C Switching Time Light to Dark 1/25,000s Gross Weight 0.75 kgsLong-lasting, environmentally-friendly power supplyPhotoelectric sensor technology with high-quality dual LCD and filterMatt black finishPortable and balanced designWelding mode & grinding modeReliable and safe arc protection