Repour Wine Saver and Stopper - Removes Oxygen, Preserving and Keeping Wine As Fresh As The Day The Bottle Was Opened - 24-Pack Blue

If you can use it multiple times for the same bottle of wine then why can't you reuse it for another bottle? Do they magically stop working?

Can you clarify how long Repour lasts? Is it single use (meaning one on, when off throw away), one bottle or something different?

Is it necessary to keep the wine in the fridge?

What kind of material? if plastic, is it bpa free?