This is the LilyPad Arduino Simple Board. It's controlled by an ATmega328 with the Arduino bootloader. It has fewer pins than the , a built in power supply socket, and an on/off switch. Any of our LiPo batteries can be plugged right into the socket. The Simple 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 a power supply. 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! Can't decide which Arduino is right for you? ! Project description, more information and ordering can be found at https://www.sparkfun.com/products/9725 Leah Buechley's LilyPad Tutorial: http://web.media.mit.edu/%7Eleah/LilyPad/ LilyPad Arduino Documentation: http://www.arduino.cc/en/Main/ArduinoBoardLilyPad