LED Display 7 Segment 4 Digit Red Common Cathode with ColonVersatile LED display. Easy to use with MAX7219CNG display driver and Arduino.Various libraries available. This is the one we use.Specifications4 Digits with colon.56 inches hightHi red colorCommon cathode pin - easy to drive with MAX7219CNGFace color blackLens epoxy color white, diffused