C/A-1501X, C/A-1505X SINGLE DIGIT DISPLAY is the enhanced version of C/A-1501X. It has the same electro-optical characteristics, external dimensions and package as C/A-1501X, but has higher luminous efficiency. Red LED is GaAsP/GaP, green LED is GaP, yellow LED is GaAsP/GaP, and super red LED is GaAlAs. The emission wavelengths are 635nm, 565nm, 585nm and 660nm respectively.