The Wine Saver is a vacuum pump which extracts the air from an 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 vacuumslows down the oxidation process which makes it possible to enjoy your wine again on a later date 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 Features . Vacuum pump extracts air from opened bottle of wine. Slows down oxidation process preserving flavor. Click sounds tells you when optimal vacuum has been reached. Includes one reusable pump and stopper Specifications . Weight 0 56 lbs