This is a round PCB with 6 LEDs and a WS2811 driver chip. It requires 12V DC supply. All 6 LEDs can be controlled as one pixel, not separately. There are 4 input connection pads marked as 12V, GND (2 pads) and Din (data input). The same goes with output connection with data output is marked as Do. These LEDs are capable of displaying 24-bit true colour. That's 16 million colour variations!
Multiple boards can be connected to form a string of addressable LEDs with only 1 pin connection from microcontroller for data signal. Just connect the output connection of one board to input connections of the other board. The data direction is indicated by arrows printed on the board.
WS2811 has a strict timing protocol. They can be controlled with a real-time microcontroller such as the Arduino, AVR or PIC. They don't work well with Linux based board such as Raspberry Pi or BeagleBone Black. If you want to use these boards, check out our WS2801 or LPD8806 LEDs instead. Update: Jeremy Graff has created an excellent rpi_ws281x library to control WS2812 LEDs from a Raspberry Pi.
