AD16-12A series indicators adopt high-brightness pure-color LED luminescent chip as light source with long service life, low energy consumption, small volume, light weight, high brightness, good reliability, aesthetic shape, delicate workmanship and compact structure, which can meet the demand on panel miniaturization and intensive control at a higher level. They are suitable for the applications using light signal as indication in the lines of equipment in the field of electricity, telecommunication, machine tools, ships, textile, printing, mining, etc.