Octopus card

The Octopus card is a reusable contactless stored value smart card for making electronic payments in online or offline systems in Hong Kong. Launched in September 1997 to collect fares for the territory's public transport system, it has grown into a widely used system for transport and other retail transactions in Hong Kong. It is also used for purposes such as recording school attendance and permitting building access. As of 2016, the cards are used by 98 percent of the population of Hong Kong aged 15 to 64 and the system handles more than 14 million transactions, worth over HK$180 million, every day.