... 2.size:A1,A2,A3,A4,A5 3.light panel 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 consumption,power-saving 60%7.Easier to change ...