RED WIRE: DC5V input +

yellow wire:DATA

greem wire: clock

blue: Ground 

input side: is the side with IC 

RGB Pixels are digitally-controllable lights you can set to any color, or animate. Each RGB LED and controller chip is molded into a 'dot' of silicone. The dots are waterproof and rugged. There are four flanges molded in so that you can 'push' them into a 12mm drill hole in any material up to 1.5mm/0.06" thick. They're typically used to make outdoor signs 
The pixels use 8mm diffused RGB LEDs, with a 120 degree beam width. The total max brightness of all LEDs is about 1600mcd but with the light more evenly distributed & mixed than a clear LED

12mm diameter (0.45") 75mm deep (1.5")
100mm

50 pieces per strand

These pixels use a WS2801 chip for full 24 bit color

5V power, 60mA maximum per pixel (LED on full white)

2-pin SPI-like protocol

WS2801 Datasheet for the chip inside each pixel

Brightness: Red = 3.3 Lumens/300 mcd, Green = 10 Lumens/1000 mcd, Blue = 2.7 Lumens/300 mcd (mcd calculation based on full 120 degree beam)