Outdoor LED signs, or Electronic Message Centers (EMCs) are computerized programmable electronic visual communication devices, specially manufactured for the outside environment. They are capable of storing and displaying multiple messages in dozens of formats and at varying intervals. Electronic Message Boards (as they are sometimes referred to as well) allow you to change your message frequently, but without the cost of replacing missing or broken letters, and without the physical labor involved in changing copy. Thus, LED signs allow you to communicate more effectively with the typical person passing by at a particular time day by changing the message and graphic of your sign to match the profile on the street.