Visa Electron is a debit card available across most of the world, with the exception of Canada, Australia, Ireland and the United States. The card was introduced by Visa in 1985 and is a sister card to the Visa Debit card. The difference between Visa Electron and Visa Debit is that payments with Visa Electron require that all the funds be available at the time of transfer, i.e., Visa Electron card accounts may not normally be overdrawn. Visa Debit cards, on the other hand, typically allow transfers exceeding available funds up to a certain limit. Some online stores and all offline terminals (like on trains and aircraft) do not support Visa Electron because their systems cannot check for the availability of funds.