The OSY5MKS4C1A is an electronic part manufactured by Optosupply which features a yellow LED with a luminous intensity of 750÷1120mcd, a viewing angle of 120°, a voltage range of 2.5÷5V, and a maximum current of 20mA. Its variant, blinking, makes the LED light up for a short instant and then shut off, creating a flashing effect.