A product, comprising: a package comprising: one or more tobacco-containing articles received in the package, a first body portion defining an opening and a second body portion moveable with respect to the first body portion between a closed configuration in which the second body portion substantially closes the opening and an open configuration, wherein the one or more tobacco-containing articles are received in the first body portion and accessible via the opening in the open configuration; said package comprising a control circuit comprising: a power producer; and an output mechanism configured to receive an electrical current from the power producer and output a perceptible effect; said product being characterised in that: the power producer comprises a plurality of films (138, 140) configured to produce an electrical current via movement between the films (138, 140); and the movement between the films (138, 140) in response to movement of the second body portion relative to the first body portion produces the electrical current to output the perceptible effect of the output mechanism. a package comprising: one or more tobacco-containing articles received in the package, a first body portion defining an opening and a second body portion moveable with respect to the first body portion between a closed configuration in which the second body portion substantially closes the opening and an open configuration, wherein the one or more tobacco-containing articles are received in the first body portion and accessible via the opening in the open configuration; one or more tobacco-containing articles received in the package, a first body portion defining an opening and a second body portion moveable with respect to the first body portion between a closed configuration in which the second body portion substantially closes the opening and an open configuration, wherein the one or more tobacco-containing articles are received in the first body portion and accessible via the opening in the open configuration; said package comprising a control circuit comprising: a power producer; and an output mechanism configured to receive an electrical current from the power producer and output a perceptible effect; said product being characterised in that: the power producer comprises a plurality of films (138, 140) configured to produce an electrical current via movement between the films (138, 140); and the movement between the films (138, 140) in response to movement of the second body portion relative to the first body portion produces the electrical current to output the perceptible effect of the output mechanism. a power producer; and an output mechanism configured to receive an electrical current from the power producer and output a perceptible effect; said product being characterised in that: the power producer comprises a plurality of films (138, 140) configured to produce an electrical current via movement between the films (138, 140); and the movement between the films (138, 140) in response to movement of the second body portion relative to the first body portion produces the electrical current to output the perceptible effect of the output mechanism. the power producer comprises a plurality of films (138, 140) configured to produce an electrical current via movement between the films (138, 140); and the movement between the films (138, 140) in response to movement of the second body portion relative to the first body portion produces the electrical current to output the perceptible effect of the output mechanism.