LEDs — those blinky things. A must have for pow­er indi­ca­tion, pin sta­tus, opto-elec­tron­ic sen­sors, and fun blinky dis­plays.This is a very basic 5mm LED with a yel­low lens. It has a typ­i­cal for­ward volt­age of 2.0V and a rat­ed for­ward cur­rent of 20mA.