... 3 Light Transmission 80% to 90% 4 wire touch panel Specifications:Optical Clarity 80%Operating Temperature -10C ~ ... Resistance 20MΩ↑ DC25VSealable against dust ,water, oil , static Touch panel instantly truns LCD/PLASMA/front/rear projection monitor into ... proof, water proof, dust proof, sunlight operability present the IR touch screen an ideal choice for interactive presentation, classroom whiteboard, ...