These Electronic Display message centers are available for indoor use and can be used as a single stand-alone display or can be networked into a plant wide communication system. When networked, one message can be transmitted from the controlling computer software to all the message centers or discrete messages can be sent to specific addresses within the network of displays. The alphanumeric character sizes range from 2" to 18" high. As a rule, 1" of display height is equal to 40 - 50 feet of viewing distance. So, a 4" high character can be seen up to 200 feet away! Designed to withstand the industrial environment, the extruded aluminum enclosures are also sleek and attractive. Electronic Displays features both scrolling (moving message) and static (fixed message) marquees.