With a few simple operations you get a new message up, by simply removing one graphic roll and replacing it with a new one. This feature reduces your marketing costs as you can now use several graphics for the same display and handle the graphic exchange by yourself.
Read more about Expand MediaScreen 4
http://www.prlog.org/10014605-expand-international-launches-new-retractable-display-that-allows-for-easy-graphic-exchange.html