... 3.rs232 control system 4.We can OEM the function Led Digit Sign1, Digit height:8”/10”/12”/16”/18”/20 ... available,(Supply according to customer’s request).3, Color: Red, Green, White, Blue, Yellow.4, Display numberals”0.1.2.3 ... the functions of controller according to your demand.(Time,Date,Price,Temperature,Digit etc.) Rs232 LED Digit Sign(Gas Price,Time/Date Sign )