The power shield can be used to connect a iPod battery and to connect (power) LEDs to the Lithne. The power shield can use the iPod battery to act as a completely wireless node, and is also able to charge it when the Lithne is powered through a power adapter. The power shield has four build in LED drivers which allow you to connect (multiple) 20mA, 350mA or 700mA LEDs in series. In case you power the Lithne via a iPod battery, you can only connect single 20mA LEDs. See schematics for more information.