... Size:710mmX160mmX40mm 2,4" red 6 digital led digital clock 100% feedback Led digital clock with computer RS232/485 communication ... Certificate:CEFunction requirement:1, Left 2 digital hours,middle 2 digital minutes,right 2 digital seconds,interval use 4 luminescence led2, ... optimize the contrast ratio and overall brightness, features a unique louver system to shade each individual diode from the glare ...