The light-emitting diode has an integrated chip oscillation circuit inside, and the appearance is no different from the general light-emitting diode. Just connect the power supply to light up the two colors in turn, 1 second 1 change, I bought 5MM red, blue from Flash. From the outside, it is in series, but not necessarily in series
LED string lights:
Light-emitting diodes are called LEDs for short. Made of compounds containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc.
When electrons and holes recombine, it can radiate visible light, so it can be used to make light-emitting diodes. It is used as indicator light in circuits and instruments, or composed of text or digital display. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and gallium nitride diodes emit blue light. Due to chemical properties, it is divided into organic light emitting diode OLED and inorganic light emitting diode LED.