2x2 Square Matrix WS2812B 4 Pixels "Smart RGB" LEDs
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WS2812B "Smart RGB" LED Matrix - 4 Pixels
A super-bright WS2812B Square Matrix with "Smart RGB" LEDs
Data in is timing-specific so you will need to use standard WS2812 code such as FastLED library for Arduino
Dimensions: 15 x 15mm