The DY-PT204-6C is a type of infrared LED manufactured by TONYU that is encapsulated in an through-hole package with an outer diameter of 2.54mm. It is RoHS (Restriction on Hazardous Substances) compliant and features six closely-spaced LEDs around the circumference. The LED emits infrared light, which is in the invisible range of the electromagnetic spectrum. This feature makes it useful for applications such as wireless remote control, motion detection, or data transmission.