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Reference size: The outer diameter of the bottle mouth: 29mm0.5mm. The inner diameter of the bottle mouth: 20mm0.5mm. !!!Kindly Notice: The product does not come with batteries, you need to buy 2 pieces of AAA batteries by yourself!!! Automatic Repeated Detection The electronic wine stopper will automatically detect the air pressure in the red wine bottle. When the pressure in the bottle exceeds -0.01 Mpa, it will automatically perform repeated vacuuming to ensure that the vacuum state is reached at any time and truly achieve the effect of efficient freshness . Use Suggestions: Step 1: Press the wine stopper down to the rubber part of the bottle mouth. The wine stopper will start to work automatically when it is pressed into the bottle. Step 2: The blue stopper displays a blue breathing light during normal operation. When the vacuum inside the bottle is exhausted, the blue light turns on after 5 seconds. Step 3: During the storage process, the wine stopper will automatically detect the air pressure in the bottle. When the negative air pressure exceeds -0.01 Mpa, it can be automatically evacuated multiple times. Step 4: When the bottle tilts to 45 degrees while the wine stopper is working, the anti-fall function is triggered and stops working, the red indicator light flashes. And when the bottle is less than 45 degrees, the wine stopper will start working again. Packing List: *1 Electric vacuum wine stopper *1 Manual *1 English box Product Specifications: Net weight: 975g Product size: 71*48.5*71 mm Packing size: 80*51*80 mm