Taiwan's currency is the New Taiwan Dollar (TWD), which is divided into 100 cents. Foreign currencies and travellers cheques (American Express, Citibank or Thomas Cook) can be exchanged at government-designated banks and hotels. Receipts are given when currency is exchanged, and must be presented in order to exchange unused NT dollars before departure. Major credit cards such as American Express, Master Card, Visa, and Diners Club are accepted. Banks are open Monday to Friday. US dollars are the preferred currency. ATMs are plentiful but not all accept international bank cards.