This is a wine stopper for preserving leftover wine. I purchased it two years ago, but I'm no longer using it, so I'm offering it to someone who can use it. There are no instructions. The following is quoted from the purchase site. Please refer to it for use. --------------------------------------------------- About this product [Keeps Freshness] With simple manual operation, it removes air from the bottle and preserves it in a vacuum state, effectively maintaining the freshness of wine and sake. It can preserve freshness in the best condition for about 7 days, and the flavor remains unchanged even after re-opening. "Note: Not for use with sparkling wine, champagne, beer, and other carbonated beverages." [High-Precision Vacuum] Food-grade silicone, innovative two-layer silicone design, each layer precisely bonds with the inner wall of the wine bottle, maintaining a high-level vacuum of 0.038mpa inside the bottle, achieving a strong vacuum seal, 100% leak-proof. Easy and convenient, no need to struggle with opening corks, a convenient item to enjoy wine casually. [Date Selection] Easy to use and innovative date check design, you can select the date of wine preservation by rotating the wine stopper. No more forgetting the storage period of your wine! [Easy to Use] ☛ Wine vacuum preservation: 1. Firmly insert the wine stopper into the mouth of the bottle. 2. Press the plug several times (until the numbers are visible in the small window) to remove the air from the bottle. 3. Rotate the wine stopper and select the corresponding storage date. ☞ How to remove the plug: Gently move the stopper upwards, and you will hear the sound of air flowing, and it can be opened. "Instructions are also included" [Product Specifications] Wine stopper dimensions: 4.16x4.16x5.75cm, weight: 75g. Packing dimensions: 4.4x4.4x6cm. Material: Food-grade silicone + ABS resin. This product can store leftover wine in the best condition, a must-have for wine lovers. Applicable to standard Bordeaux wine bottles. --------------------------------------------------- The price includes shipping, so I will not accept price negotiations. Please purchase only if you understand that this is a used item.