Yes you would need a to a 24v power source.
Not sure if it has one one WS2811 per 12 nodes or not.
It can work as one Pixel, working with WS2811 controller. Statement it seems to mean each circle can be programmed to change colors.
Product Description
DC24V WS2811 pixel module, with 12pcs 5050 RGB SMD LED,100mm diameter,20pcs a string;256 gray scale
DC24V, WS2811IC signel color modules.
power 2.88W. It can work as one Pixel,
working with WS2811 controller.
Can download the programs in SD card,
One WS2801 controller with SD card can off-line control Max 2048 Pixel.
It have single color running scene
control IC type: WS2811(high mode)
gary scale: 256
current:18.5mA ±3%
working voltage:DC24V