The UVP-4057/4157 4257AA/4357AA is 4.0 inch (101.6mm) height 5X7 dot matrix display. Single color display have the choices of three bright colors-AlGaAs red/green/red orange. Multicolore display are applicable to two colors: green and red orange. All device have gray face and white dot. The AlGaAs red LED chip are made from AlGaAs on a non-transparent GaAs substrate. The green LED chip are made from GaP on a transparent GaP substrate. And red orange LED chip are made from GaAsP on a transparent GaP substrate.