A stored-value card includes a housing and at least one internal wall substantially enclosed within the housing. The housing includes an account identifier signifying a financial account or record linked to the stored-value card. The at least one internal wall is configured to define an airflow chamber within the housing. The housing defines an opening leading into the airflow chamber. The stored-value card is configured to produce a whistle sound when air enters the airflow chamber from the opening and moves within the airflow chamber.