China's National Immigration Administration has urged mainland holders of the old passport-like travel permit to Hong Kong and Macao to update to the latest version.

A sample of card-like travel permit to Hong Kong and Macao. (Photo: China News Service)

The booklet format, with a blue cover, will expire on September 13, and mainland residents need to opt for the credit-card sized document, which was first introduced in September 2014, according to the administration.

Exit endorsements issued to the booklet-type permit are affixed on one of the endorsement pages, similar to visas, while card-type permits have the information stored in the chip.

In recent years, the mainland has facilitated application and issuing of travel permits to the two special administrative regions.