... .Intelligent Control System 3.Error Detection 4.3000Hz Refresh advertising LED digital billboard1. Function and Technology Character (1) Multiplied file formats, ... over 281 trillions, high brightness, and very high contrast. (4) Show all kinds of word, text, graph, picture, video, 2-dimention ... Can be connected with PC and the web net and show the content, and also can be controlled remotely via VPM ...