The UVS-546A/547A is 0.52 inch (13.2mm) 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 displays has gray face and green segments. Bright red , yellow , and red orange displays have gray face and whit 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.