36mm Square 12V Digital Addressable RGB LED Pixels 

Part No:IL-M3535WS2801

Features: 

1.DC12V 0.96W/pcs

2.4led Epistar SMD5050 RGB 

3.WS2801 IC to control 4led

4.36mmx36mm square (1.4")5mm deep(0.2")

5.20pcs/string or customized,4Pin JST SM female and male connectors

6.75mm/3" apart on the strand

What's more

Those square pixels are a string of 20pcs rgb led pixels,each with 75mm/80mm between the next. Each pixels are made by 4pcs smd5050 rgb leds and a ws2801 ic chip,which is soldered by 4pin color cable to be stranded together. 

Those pixels use 4 led with smd5050 RGB,with 120 degree beam width,which are connected by a 4 color cable,that is DC12V+,DATA ,CLK and GND,of course,extra power cable for each chain.They are made by chains,and also for the Data is transfer on pixel to next pixel so that you can cut them as you need or add more chains together.

As for controller, the pixel modules are SPI signal,you can use sd card controller such as K-1000c,k-8000A,LM501. Those pixel modules also works with DMX protocol, you can use dmx controller which have function with dmx to spi transfer, such as LM501.The third way is using dmx decoder in the middle and change SPI into DMX protocol,then work with Madrix.The fouth way is some DIY controller such as arduino controller, wifi controller,blutooth controller.