The Wine Saver is a vacuum pump, which extracts the air from an opened bottle and reseals it with a reusable rubber stopper. Place the reusable stopper in the bottle and extract the air from the bottle using the Wine Saver pump. A “click” sound tells you when you have reached the optimum vacuum level. The vacuum slows down the oxidation process which makes it possible to enjoy your wine again on a later date. -Preserves your wine after opening -Vacuum indicator: clicks when vacuum is reached -Not suitable for sparkling wines