A stored-value card includes an electrical assembly and a housing. The electrical assembly is configured to store an audio file and includes a light and a speaker. The housing encloses the electrical assembly and includes an account identifier signifying an account or record linked to the stored-value...http://www.google.es/patents/US7434735?utm_source=gb-gplus-sharePatente US7434735 - Stored-value card with sound and light
