Repour Wine Saver - Wine Preserver and Stopper - Removes Harmful Oxygen from your Wine Simply and Effectively - Indigo Black (10 Pack)

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?