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LEDs, short for Light Emitting Diode, are diodes that have a special property that allows them to light up when given enough current at the correct voltage. These 5 mm diameter, red LEDs are perfect for any project where you need an indicator LED for any reason (debugging, notification, frequency control..etc). These red LEDs are perfect for use with your DIY effects pedal whether the effects pedal is on or off, or for any other DIY electronic project that requires visual cues.