A card whose principal character is that of a greeting card generally remains in heading 4909, but if the electronic component is substantial enough to change the article's essential character, reclassification to an electrical or electronic heading may be warranted. Consult the General Rules of Interpretation and consider requesting a binding ruling for cards with complex embedded components.

No. The heading explicitly covers cards 'with or without envelopes or trimmings,' so packaging a card with a matching envelope or ribbon does not change its classification, provided the card itself remains the principal article.