These Pixel Sticks have 8 of the 5050 (5mm x 5mm) smart RGB LEDs onto a PCB with a chainable design.
Use only one microcontroller pin to control up to 128 chained together!
Each LED is addressable as the driver chip WS2811 is inside the LED.
Power the whole thing with 5VDC.
Fun to experiment with and are easy to use!