HDSP-2504 alphanumeric display by Hewlett Packard. Format: 8-digit, 0.27" high 5 x 7 dot matrix. Colour: AlGaAs Red Package: 15.24 mm (0.6 inch) 28-pin DIP Download HP HDSP-2504 .pdf datasheet: Status: NOS (New Old Stock) RoHS compliant: tbc **Note: built in ROM character set + user defined characters.... very nice high end display.