RGB Pixels are digitally-controllable lights you can set to any color, or animate. Each metal 'pixel square' contains 4 RGB LEDs and a controller chip soldered to a PCB. The pixel is then 'flooded' with epoxy to make it waterproof. These are fairly large pixels but they have a lot of nice mounting options, such as two metal flanges on the side and a 0.15"/so you can screw them directly onto a surface. They're typically used to make outdoor signs.

The pixels are connected by a 4-conductor cable. +12VDC, clock,data and ground, Data is shifted down from one pixel to the next so that you can easily cut the string or attach more onto the end.+12v:Red,GND:Yellow,DAT:Green,CLK:Blue. Color order :Red,Yellow,Green,Blue.

Each dot is digitally controlled,  (24-bit color for 16 million different shades). The pixels must be clocked by a microcontroller, it easy to adapt it to any other microcontroller.

The pixels use 4 x 5050 RGB LEDs, with a 140 degree beam width. All of the LEDs are controlled at once so you cannot have one pixel with the four LEDs different colors. (Color control is per single square 4-LED pixel only) The total max brightness of all LEDs is about 6000mcd.

Sold by the strand, each strand has 20 pixels in series! Each strand has two JST SM 4-pin connectors so you can connect multiple strands in a row, as many as you wish, just watch for how much current they want. The two power wires are brought out separately to make wiring easier.