The 555-4009F is a red, quad-block Circuit Board Indicator designed for 5V systems. It emits red light with a peak wavelength of 650 nm and a typical luminous intensity of 0.9 mcd. Featuring an integrated resistor, the device has a typical forward voltage of 2.6 V when tested at 5 volts and can handle a maximum DC forward voltage of 6 V. This RoHS compliant component is designed to operate reliably across a temperature range of -40°C to +85°C and provides a wide 90-degree viewing angle, making it suitable for various status indication applications in electronic equipment.