Ultra thin :The thickness is between 2.8cm to 4.5 cm, the weight is so light and conveninet for transporting. Beautiful appearence. It could be widely used in many filed for exhibition. Energy save: it can save nealy 75% energy than the traditional one. Light source: T5 & LED Easily Changed : It's easy for you changing the picture of snap ,screw and door-opening frame.Environmental protection: economize space,litte noise & heatness