The 553-0221-400F is a 3 mm bi-level circuit board indicator (CBI) designed for through-hole mounting on printed circuit boards. It features a dual-color LED configuration with red and green single-color LEDs positioned at two locations, enabling two-state visual indication. The indicator operates with a test current of 2 mA and delivers typical luminous intensity of 1.6 mcd per color, with a viewing angle of 60 degrees in a right-angle configuration. Operating across a wide temperature range from -55°C to +100°C, this component is suitable for industrial control panels, status monitoring systems, and equipment requiring compact, reliable dual-state visual feedback.