The LilyPad Arduino Simple Board is a board designed to use in wearables and e-textile. It is controlled by an ATMega328. Compared to LilyPad Arduino Main Board, it has fewer pins. The large pads used in the sophisticated design are added to allow the LilyPad to be sewn into textiles. The best thing about LilyPad Arduino Simple Board is it’s being washable.
This new version of LilyPad board has a JST socket so you can directly connect a Li-Po battery and supply the board. The JST socket and the built in charging circuit lets you recharge the batteries. The onboard switch helps you to save power when you don’t need to use the LilyPad.
Arduino Web Site
http://arduino.cc/en/Main/ArduinoBoardLilyPadSimple