Optoma 4K400STx Bright 4K Short Throw Projector For Classrooms And Offices 4000 LumensBright, True 4K UHD short throw projector for classrooms and meeting spaces Discover the short throw version of the 4K400x, for when you want a big screen in a smaller space. Future proof your classroom or meeting room with this high brightness True 4K UHD short throw projector. The 4K400STx delivers rich visuals in any environment even when total ambient light control is not possible. This projector boasts two HDMI ports, audio connections, USB to