Each plastic PVC 'pixel bar' contains 4 RGB LEDs and a controller chip soldered to a PCB. The pixels are connected by a 4-conductor cable. You can easily cut the strand or attach more onto the end.

Each piece has +12VDC, ground, data and clock inputs. The pixels use 4 x 5050 RGB LEDs. Each dot is digitally controlled, with an internal 8-bit PWM LED driver (24-bit color for 16 million different shades). Each strand has two JST SM 3-pin connectors so you can connect multiple strands in a row, as many as you wish, just watch for how much current they want.

Technical Details:

• 36mm x 36mm sticks 5mm deep
• 4mm mounting holes 75mm apart
• 75mm apart on the strand
• 12VDC power, 120mA maximum per pixel (LEDs on full white)
• 2-pin SPI-like protocol

Documents:

• WS2801 Datasheet
• Example Code and Arduino Library