Rainbow Ring library, and information
Specificiation
CPU: Atmega 168P (Lilypad Board in Arduino IDE) Bootloader: Optiboot diecimila Supply voltage:5V Output voltage:5V Interface: Serial/I2C/Digital pins Push button x2 12 SMD RGB LED Firmware upgradable Stand-alone operation: No microcontroller needed for light script playback Diameter:61mm
Check the wiki for more information: http://www.dfrobot.com/wiki/index.php?title=Rainbow_Ring_V3_(SKU:DFR0141)