Transactional cards such as credit and debit cards include sensory features including sounds, sights, and/or smells to increase the interest in the transactional card. A transactional card may include circuitry for producing sounds such as sound effects, songs, and catch phrases. A transactional card...http://www.google.com.au/patents/US7584895?utm_source=gb-gplus-sharePatent US7584895 - Transactional cards with sensory features
