The product variety, easy to expand derivatives, strong competition in the market, selective large, application flexibility, short production cycle, the price is not very high, can be a large number of shipments. 

 7 can directly drive LED. Text and images can change the MASK to change, with a variety of display, an external shock resistance cell is not very high, can a large number of shipments. 

 Different text and graphic content can be specified by the customers provide.