This is the LilyPad Arduino SimpleSnap Board. It's controlled by an ATmega328 with the Arduino bootloader. It has fewer pins than the LilyPad Arduino Main Board, a built in battery, and button snap connectors!
Want a bare-bones, compact LilyPad? Although it has fewer I/O than a standard unit, it is more complete with a built in battery and included switch. The SimpleSnap board is designed to streamline your next sewable project by keeping things simple and giving you more room to work and eliminating the need to sew in a power supply. This version includes easy button snap connectors rather than soldering pads to make designs robust yet flexible. And like other LilyPad designs, it runs at 8MHz for lower power consumption.
LilyPad is a wearable e-textile technology developed by Leah Buechley and cooperatively designed by Leah and SparkFun. Each LilyPad was creatively designed to have large connecting pads to allow them to be sewn into clothing. Various input, output, power, and sensor boards are available. They're even washable!
Note: A portion of this sale is given back to Dr. Leah Buechley for continued development and education of e-textiles and also to Arduino LLC to help fund continued development of new tools and new IDE features.