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The C5 is a remote-controlled LEGO® MINDSTORMS® blimp, which uses helium to become almost weightless. This results in the ability to fly using the LEGO propellers and motors. The blimp is controlled using a LEGO joystick (a design inspired by Philippe Hurbains NXT joystick). The blimp communicates with the joystick using the built-in Bluetooth connection.