... .Own R&D, Free Customize Software 2.Dual Users Writing 3.IR Multi Touch 4.Material 100%Aluminum 5.FCC ... AppearanceBlack aluminium alloy frame, honeycomb aluminum board surface, imported writing film covered matt surface, with optimized projection process, erasable for ... humidity10~98%Storage temperature-40~+50°CStorage humidity10~98%Writing toolFingers or other any non-transparent object, comment art ...