KD1-504ARA is a 0.50-inch (12.70 mm) single-digit red 7-Segment LED Display with a 630 nm dominant wavelength and common anode configuration. This Through-Hole (THT) LED Numeric Display features white segments on a gray surface and is designed for readable numeric indication at distances up to approximately 7 meters, including under bright ambient lighting. The package uses a 2.54 mm pin pitch with 15.24 mm row spacing for PCB through-hole mounting. A black surface with white segments is also available as an optional appearance configuration upon request.