The Wine Saver is a vacuum pump, which extracts the air from the opened bottle and re-seals it with a re-usable rubber stopper. Place the re-usable 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 so that you can enjoy your wine for longer. The question "how often do I have to pump?" is a thing of the past. The unique and patented vacuum indicator will emit a "click" sound when the correct vacuum is reached.