KD1-321ARD and KD1-321CRD are single-digit red 7-segment LED displays with a character height of 0.32 inch (8 mm). KD1-321ARD adopts a common anode configuration, while KD1-321CRD uses a common cathode configuration. Designed for readability at distances up to approximately 7 meters, these display deliver excellent reliability under bright ambient lighting. 

The standard version features red segments on a black surface. An optional version with red segments on a gray surface is also available upon request.