4 sensors with TRUE COLOR filter. Solar cell power supply and lithium batteries for outstanding LCD filter life. Features: • Viewing area: 98x80 mm • Darkening shade range: 5÷8.5/ 9-13, internally adjustable • UV/IR protection: DIN16 • Light to dark time: 1/25000 s • Dark to light time: 0.1-2.0s • Adjustable darkening sensitivity and delay • Auto on/off • Grinding feature • Low battery indicator • Ergonomic design, lightweight, well-balanced • With adjustable ring nut