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The device is powered via micro USB. The shipping notes recommend using a good quality power supply capable of providing at least 700mA at 5V. The Pi shouldn’t be powered by plugging it into another computer or USB hub, according to the documentation.
The board’s general purpose input/output pins, which can be used to connect additional circuitry to Pi and expand its capabilities.
The pins allow expansion boards to be added that work with motors, sensors and other peripherals - allowing the Pi to be used for a wide range of tasks, for instance controlling robots.
The 4GB SD card holding the image of the Debian Squeeze OS that runs on the board shipped to TechRepublic. The device has been tested with SD cards up to 32GB in size, and should work with most makes and models. A list of compatible cards is available on the Raspberry Pi wiki.