HD-C30 is Asynchronous led display controller, and working no need PC. Playing high definition programs .like video, image, animation, text, temperature, office file etc. The system include two parts HD-C30 controller and software called HD Player.
Usually one screen with 1pcs HD-C30+1PCS HUB, if the screen is bigger, for best result, user can add R500/R501 cascade connection. So HD-C30 is Full color Asynchronous cascaded controller
