Are you worried about how to preserve the remaining wine? This bottle stopper will solve the problem. Apply vacuum sealing technology， it is leak-proof and will expel the air in the bottle to keep the good flavor of wine.? <br><br><strong>Features:</strong> <br>Made of stainless steel and food-grade silicone， safe !#!amp!*! durable. <br>Easy to use， just press down and it will auto vacuum air in the bottle. <br>Excellent sealability， leak-proof in every angle. <br>After using it， wine can be preserve for at least 7 days. <br>It can manually record how many days you've opened this wine on above. <br><br><strong>Specifications:</strong> <br>Color: Silvery <br>Case Material: Stainless Steel <br>Black Stopper Material: Food-grade silicone <br>Button Size: 3.3 * 1.8cm / 1.3 * 0.71in(D * H) <br>Main Body Size: 4.5 * 4.5 * 5.3cm / 1.77 * 1.77 * 2.09in (L * W * H) <br>Item Size: 4.5 * 4.5 * 7.1cm / 1.77 * 1.77 * 2.8in (L * W * H) <br>Item Weight: 95.5g / 3.37oz <br>Package Size: 11.3 * 8 * 5.3cm / 4.45 * 3.15 * 2.09in <br>Package Weight: 134g / 4.73oz <br><br><strong>Package List:</strong> <br>1 * Bottle Stopper? <br>1 * User Manual