Advantage: If the place where they are placed is the right one, they Buy email list achieve a significant number of impacts on the public. Affordable for any business. It is a fundamental complement with which to reinforce messages that have been transmitted by other means of Buy email list such as television or radio. Active and visible 24 hours a day all year. Disadvantages: Lack of orientation to a specific and determined target audience. In this support there are times when the information that can be displayed is limited. Visualization is passive, our eyes may see it, but our brain may not Buy email list it. The return on investment and/or recognition of brands or products is difficult to measure.