luminium frame,exquisite form,portability,various colour may provide choice(such as silver,balck,red,gold) Open from four sides easy to change pictures,install and maintain, Thickness only *8mm,width only *0mm Use self-produced optices,which present light homogeneoursly Use high quality cold light sources with effective protection on image avoid yillowing with age and getting linger life-span *0%**0%energy saving compare with traditional light box. Appliability:the airport,subway station,business center,bank,marriage yarn depict building,exhibition,family etc.