VISION 2.1 - Self-darkening visor with TRUE COLOR filterOptical class 1/1/1/2Filter size 110 x 90 x 9 mmViewing area 98 x 44 mm - 2 sensors - Light dimming 3,5Darkness 9-13 - Grinding TAKProtection adjustment Internal , Variable shadingUV/IR protection up DIN16Switching time from brightto dark 1/16000 sSwitching time from dark to bright 0,1-1.0 sSensitivity/delay adjustable by infinitely variable knobPower supply Solar cells and 2 AAA alkaline batteriesON./OFF . AutomaticLow battery alarmTAK, red lightControl Min Amp ≥ 5A AC - DC.