Auto‑darkening welding mask MZ224 with solar cells and lithium battery - auto‑darkening function, sensitivity 0.00004 s and adjustable switch time from 0.1 to 1.0 s. Cartridge measures 11.8 × 8.7 × 8.5 in, viewing area 92 × 42 mm and shell made of PP. Rated for over 5,000 welding hours on combined power.