1.Automatic Air Pumping - No need for hands to pump it The electric vacuum wine saver will start to work automatically when it is pressed into the bottle mouth. 2.Intelligent Detection of Air Pressure - During the storage of wine, the wine saver will restart air pumping if the air leak happens, which creates an airtight vacuum all the time. The wine stopper keeps wine fresh longer than most wine stoppers in the market. 3.Safer Food-grade Material - The electric wine stopper is made from high quality food-grade Silicone inside and food-grade ABS outside. 4.The wine saver guarantees the safety and hygiene. Intelligent & Simple Indicator - The wine stopper works on 2 AAA batteries (not included). The wine saver features two lights indicating working process and battery power, which will light in blue when air pumping. 5.Fit for Most Wine Bottles - Fit for most red and white wine bottles (Not for champagne and sparkling wine). Great solution to store wine for household, club, bar, hotel. High-grade wine accessory, best gift for friends or wine lovers.