Preserves your wine under vacuum and makes it last. Creates a vacuum to slow down the oxidation process to store wine for a longer period. Makes a click sound when optimum vacuum is reached. With the Vacu Vin wine-saver vacuum pump and wine stopper for bottles, you can preserve your open bottle of wine from oxidizing — and enjoy it up to ten days. Extract the air from your opened bottle of wine with the vacuum pump and reseal it with a reusable rubber wine-bottle stopper. Just insert the universal wine stopper into the bottle's neck and pump till you hear the patented click sound. This signals you've reached the optimum vacuum level with an airtight seal. Your bottle is now ready to be either stored in the fridge or left on the kitchen countertop.