Vacuum wine bottle stoppers are easy to use and work very well. Its the perfect wine accessory to preserve wine that is unfinished. Just pop one on top of the opened wine bottle. Give it a few pumps to expel air from the bottle that will ruin your good wine than just forget about it until the next time you want to drink it! When you remove the VacuTOP you will hear it POP from the pressure releasing! That's how you know your wine was preserved. Zees Inc.