The UVS-51X is 0.56 inch (14.22mm) height single digit display. Choices of five colors-high efficiency red/bright red/green/yellow/red orange. High efficiency red displays has red face and red segments. Green display has grayface and green segments. Bright red, yellow and red orange displays have gray face and white segments. The bright red and green LED chip are made from GaP on a transparent GaP substrate. The yellow and red orange LED chip are made from GaAsP on a transparent GaP substrate.