Hong Kong MTR Express Travel Pass

Hi, the Airport Express Travel Pass only cover 3 consecutive days of unlimited travel on MTR (except Airport Express, East Rail Line First Class, Lo Wu and Lok Ma Chau stations).
It is counted 72 hours from the first time yuu use it. Well, for the forth days, you can add value in the card and use it. It means you can use it as an ordinary octopus card after refunding it.