EL product for learning machine 1.It's thin like paper ... . Short wave ,optical rotation ,and excellent in passing ability,especially good for a weather as dark, or fog ... products)5.No extra room needed ,easy installation and installation cost saving. 2.Reference dataThickness0.2mm-0 ... , aviation, PDA, telephone, cell phone, BP machine, VCD/DVD/MP3 and some other electrical and electronic products.