This is a breakout board for the Silicon Laboratories Si4703 FM tuner chip. Beyond being a simple FM radio, the Si4703 is also capable of detecting and processing both Radio Data Service (RDS) and Radio Broadcast Data Service (RBDS) information. The Si4703 even does a very good job of filtering and carrier detection. It also enables data such as the station ID and song name to be displayed to the user. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10775 Datasheet: http://www.sparkfun.com/datasheets/BreakoutBoards/Si4702-03-C19-1.pdf Datasheet: http://www.sparkfun.com/datasheets/BreakoutBoards/tpa6111a2.pdf Quickstart Guide: http://www.sparkfun.com/tutorials/293 Arduino Example Code: http://www.sparkfun.com/datasheets/BreakoutBoards/Si4703_Example.pde Arduino Library: http://srmonk.blogspot.com/2011/09/sparkfun-si4703-fm-receiver-breakout.html Programming Guide: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/BreakoutBoards/AN230_0.61.pdf