Automatically pump:Insert the fully into the bottleneck vertically ,automatically start pumping the air out of the bottle.It preserves better than the original cork and extends the freshness of the wine .Automatic repeated detection: the electric wine stopper will continuously and automatically detect the air pressure in the wine bottle. When the negative pressure in the bottle exceeds -0.01Mpa, it will automatically perform repeated vacuuming to keep the bottle in a vacuum state at all times .Intelligent fall prevention function: when the electronic wine stopper is in working condition, when the bottle body is tilted to 45, it will stop pumping air, the anti-falling function triggers to stop working, and when it is upright, the wine stopper will restart the pumping air .Retain the freshness and flavor of wine for up to 7 days: keep the sealed wine bottle cabinet or refrigerator for better preserving effect. .Battery powered Device: requires AAA battery x2 (not include) .