RGB Pixels are digitally-controllable lights you can set to any color, or animate. Each plastic PVC 'pixel bar' contains 3 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 plastic flanges on the ends with 0.15"/4mm diameter holes and also some sticky foam tape on the back for easy attachment. They're typically used to make outdoor signs. Compared to our other LED dots, these are much bigger and much brighter, good for larger scale installations. They'd also make great large RGB 7-segment displays which is why we have them in strands of 20. 

The pixels are connected by a 4-conductor cable. +12VDC, ground, data and clock. Data is shifted down from one pixel to the next so that you can easily cut the strand or attach more onto the end. 

Each dot is digitally controlled, with an internal 8-bit PWM LED driver (24-bit color for 16 million different shades). The pixels must be clocked by a microcontroller, we have an example code linked below that works on an Arduino, it should be simple to adapt it to any other microcontroller. 

The pixels use 3 x 5050 RGB LEDs, with a 120 degree beam width. All of the LEDs are controlled at once so you cannot have one pixel with the three LEDs different colors. (Color control is per single rectangular 3-LED pixel only) The total max brightness of all LEDs is about 4000mcd. (Please note: mcd ratings of LEDs are notoriously inflated by most LED sellers, so be extra-skeptical when reviewing LED ratings!)