2nd hand interactive whiteboards. Thirdly, High efficiency and energy saving.As the light source, the blue laser beam will be turned into red, green and blue light by the color wheel, then RGB light will be projected on the DMD chip to almost 100% display the image on the screen, which means laser only create the exact colors needed, which uses less power. But for the normal projector create light, the projector will waste most of this light, only leaving the red, green and blue parts, inefficient and energy-costing.?????????????. The IQAio GR519 is an upgraded lightweight version based on the original IQAio GR511. The original dual-cavity structure was changed to a bottom-edge structure, so that the minimalist design accommodates modern classrooms and conference rooms. With one IQProjector V2 and one IQView E3821, you can achieve flexible and intelligent classroom.