battery not included Free Your Hands: Compared to traditional wine vacuum pumps, where you need to manually press repeatedly to extract the vacuum inside the wine bottle, our electric wine stopper simply presses into place, the blue evacuation indicator lights up, and you're fully automatic Evacuate, wait for the evacuation indicator light to go out, and easily keep your red wine as fresh as ever Smart Monitoring: The wine sealer vacuum will continuously and automatically detect the air pressure inside the bottle. When the bottle pressure leakage exceeds -0.01mpa, the electric wine stopper will restart to remove the air in the bottle and maintain the vacuum in the bottle, so as to achieve a good fresh-keeping effect Anti-pour wine detection: When the wine bottle vacuum pump is working, when the bottle is tilted to 45, the anti-pour wine function will be triggered, the wine vacuum pump will automatically stop vacuuming and light a red light to remind you. This prevents the bottle from tipping and continuing to pump air and causing the wine to back up into the soft red wine stopper and cause a malfunction, when the bottle returns to less than 45 the wine stopper will work again Wine Giveaway: A wine vacuum stopper for all red and white wines, it's the best gift for red wine lovers to keep your red wine from being wasted, keeping it fresh for 7 days is as simple as that Wine Preservation System: The marofin electric wine stopper has been upgraded to solve the problem of the sealing ring falling off inside the stopper and the problem of not working after repeated use. If the power drain is very fast, double check for a red leaking wine bottle or wine cork pressed into place, otherwise the wine vacuum stopper will work repeatedly to draw a vacuum.