4x4 Square Matrix WS2812B 5050 NeoPixel 16 Way Serial RGB LED with Integrated Controllers
WS2812B Neopixel Matrix - 16 Pixels
A super-bright WS2812B (aka Neopixel) Square Matrix with smart RGB LEDs
Data in is timing-specific so you will need to use standard Neopixel code.
Dimensions: 30 x 30mm