... crystal view lens 3.Solar Powered 3.Variable shade control, welding helmetSolar Powered Liquid Crystal Auto-Darkening Welding helmet ApplicationTIG ... ,impact resistance,resistance to blows,fireproof,durable.3). Dual solar and lithium battery-powered, energy-saving and convenient.4). ... Delay timeRapid:0.2s, slow:0.8sPower supplyLithium cell+ Solar power(≥5000 welding hours)Working temperature-5°C~+55° ...