... 4.poster can be changed 5.OEM service 1.LED crystal light box with poster changing2.Size:A1,A2,A3,A4,A53 ... .transparent front-panel, "U" shape holder, Light panel, black back panel4.insert poster, easier change5.Led lifespan 80,000 hours6.Low power ... different pictures8.Customer's design\ idea or OEM are welcomed LED acrylic crystal window wall mounted light box