The UVP-7188 X SERIES is 0.787 inch ( 20.0mm) height 8X8 dot matrix display. Single color display have the choices of three bright colors-amber/green/red orange. Multicolor display are applicable to two colors : green and red orange All device have gray face and white dot. A26 The green LED chip are made from GaP on a transparent GaP substrate. The red orange and amber LED chip are made from GaAsP on a transparent GaP substrate.