LITRON LED Moving Message Signs (LMMS) are design for use for indoor and outdoor, we have single iline, 2 lines, 3 lines, 4 lines and multiple lines unit, with single color, tri-color and RGB full color graphic display panel, the letters from 2", 3", and 4" high, the length of the outside frame from 16" to 78". LITRON LED Moving Message Signs have wide viewing angle, viewing distant from 200 ft away to program the unit can choose from computer interface or remote control programming.