The Vacuvin Wine Saver Pump is an innovative device designed to keep your opened wine fresh by removing air from the bottle. It includes a vacuum pump and specially designed rubber stoppers. To use it, insert a stopper into the bottle's neck, then place the pump on top of the stopper and start pumping. This action removes air from the bottle, which helps to slow down the oxidation process that can spoil the wine. You'll know you've achieved the right vacuum level when you hear a "click" sound. When you're ready to pour another glass, simply press the small knob on the stopper to release the vacuum and allow air back into the bottle.