... 1400,RoHS approval4 Silk screen printing, spay coating, laser etching, back-lighted, hard/epoxy coating keypads5 Keypad surface ... spraying coating, PU coating6 Automatic painting and laser etching process7 Half automatic potting process to add resin ... colors.HardnessBetween30 to 80 shore ALegend/Letter/GraphicPrintingand Laser etchConductive ContactInkPrinting, Carbon PillFinishMattor Gloss PU Coating, ...