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I really like these little and lightweight programable LED board. Super small! You can use these on different places on your quadcopter. Really the best 4x1 LED board. For the best 2x2 board follow this link >>> https://bit.ly/4bitLED
They're just about as wide and long as my frame's arms (2,5" CMW Massive Droner). They're super bright and make the micro quad much easier to spot in other people's FPV feeds or when you "land" in trees/grass etc. :)
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