3mm

Compact through‑hole indicators in fixed colours and RGB variants provide quick power or status feedback on small boards, panels and educational kits where space is limited. They can be used as simple indicators, decorative lighting, or compact signage in enclosures and prototypes. They are easy to wire with a current‑limiting resistor and drop into standard layouts, breadboards, and printed circuit boards.

Different attributes exist across this size range, including fixed‑colour versus RGB types, brightness and viewing angle, and drive compatibility with common electronics. RGB versions offer colour‑mixing feedback, while standard colours deliver clear, low‑cost indicators. The category balances reliability, ease of integration, and broad availability for quick prototyping and finished projects.