This is the PICAXE-20M2 microcontroller chip.

PICAXE is a neat entry-level microcontroller system that is relatively cheap to get started with.
The chip is programmed with a simple serial connection and the BASIC development environment is free! PICAXE has some excellent educational applications and support, and is a great entryway into more complicated embedded systems.

If you're looking for a place to start with microcontrollers, PICAXE is a great way to go!

 

Documents:

• Datasheet
• What is PICAXE?