The Vacu Vin Wine Saver is a patented vacuum pump which extracts the air from the opened wine 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 Vacu Vin 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 at a later date! Not for sparkling wines.