The Shenzhen Travel Card and Hong Kong’s Octopus Card will become interchangeable on September 4, making life more convenient for people who regularly travel in both cities, local media have announced.

A Shenzhen woman who regularly goes shopping in Hong Kong, Miss Liu, told local television that the new measure will save her time and money. Other residents echoed her statement.

Wang Dongjun, the CEO of Shenzhen Travel Company added that wherever you used the card it would pay in Hong Kong Dollars or RMB, depending on where you are. The cards can be used to take, buses, taxies, the subway and make small purchases in selected stores such as 7-11.

Residents can also add money in either Hong Kong Dollars or RMB, depending on which city they are in.

This will, however, require the purchase of a new card.  Existing Shenzhen Tong and Octopus cards don’t have the dual-currency capability, so you’ll have to pony up for an upgrade.