LEDs help you to signal or show information. Listed here in all the colors you wish.
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MAX7219 8-Digit LED Display $ 3.15
4-Digit 7-segments Module $ 3.03
8x8 MAX7219 dot matrix $ 2.93
4-in-1 MAX7219 dot matrix $ 4.05
300x assorted LEDs $ 5.01
LED traffic light $ 2.94
Various LEDs per piece $ 0.17
8-bit WS2812 5050 RGB LED $ 2.59
12-bit WS2812 5050 RGB LED $ 2.62
16-bit WS2812 5050 RGB LED $ 4.07
24-bit WS2812 5050 RGB LED $ 3.03
64-bit WS2812 5050 RGB LED $ 10.12
256x WS2812b RGB LED panel $ 27.89
50x WS2811 RGB LED 5V or 12V $ 14.03
4M WS2811 RGB LED 12V $ 17.75
20x3 WS2811 RGB LED 12V $ 12.07
Remote WS2811 RGB LED 12V $ 4.21
Led stip cable $ 1.66
TM1638 Display Module 8 Bits Digital LED $ 3.32
2000x Resistors $ 8.09
LED spectrum analyser $ 45.75