HKG Airport Express Card

Is this Airport Express card at HK 220 has a HK 50 deposit which I can have my refund as I leave the airport when I return at the airport where I purchase the card? And there is a one way MTR rail ride either from the airport 1st day or to the airport after my 4th day in HK?

I understand that this HK 220 AE card has a single journey for the express metro which can be utilised either going to the central of HK or after the 3rd day the express train can still be use if I did not use it from the airport to the central of Hk on the 1st day I purchase the card. Am I correct? Please advice and Thank you .