... indoor, application;2) Digit height: 0.5" 1.0" 2.3";3) Single digit, with black or grey surface;4) Various emitting colors ... ),pure green(525nm),yellow(590nm),blue(430nm), pure blue(470nm);5) Advantages: long life, low voltage, energy saving, even luminance, good ... gas satation, and other different display areas of equipment/machine;7) We welcome to receive your custom requirements.