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| [* black] The next components to install are the LEDs. Light emitting diodes are used in all sorts of electronics to provide bright, different colored lights. | |
| [* icon_note] Note that the two leads are different lengths. Since an LED is a diode, it only allows current to travel in one direction, so it is important to install the correct lead in the correct hole. | |
| - | [* red] The four LEDs belong in each of the four terminals marked LD1 through LD4. |
| + | [* red] The four LEDs belong in each of the four terminals marked ***LD1*** through ***LD4***. |
| [* black] When installing the LEDs, insert the shorter of the two leads into the hole next to the flat part of the printed circle. |