The 559-1301-027F is a snap-in LED panel mount indicator from Dialight's 559 series, designed for high-brightness applications in electronic test and measurement instruments, communications testing equipment, and hand-held devices. This low-current red LED variant features a peak wavelength of 565 nm, typical intensity of 1.8 mcd, and forward voltage of 1.8 VDC at 2 mA operating current, with a 50° viewing angle. The indicator accommodates a 0.250" (6.35 mm) mounting hole with panel thickness support of 0.031" to 0.062", operates across a temperature range of -55°C to +100°C, and is housed in black UL94V-0 flammable-rated plastic. It supports multiple voltage options (1.6–3.6V DC with resistor, or 5/12/24V DC without resistor) and offers flexible termination with straight terminals or 24 AWG wire leads in 6" or 14" lengths, making it ideal for applications requiring reliable visual status indication in compact form factors.