Enter from outside when open: State Toggles, Gravity works.
Enter from inside when open: State Toggles, Gravity works.
Enter From outside when closed: Activator may have to be switched twice to open door
Enter From inside when closed: No function available.
That override switch sure is a good way to vent your ship into space.
Overall not a bad airlock but if you have more than one on your ship it's not possible to open the airlock from the inside without interacting with the door itself.