1. Centralized date display function, convenient and quick 2. Vacuum pressure display, efficient preservation, simple and compact, integrated storage and memory 3. Simple operation and convenient cleaning 4. Windowed function display 5. Piano paint surface, fine workmanship Features: Color: Black Configuration: wine stopper*1 Size: 6*4.16cm Material: ABS, Silica Gel for food contact Weight: 50g Instructions: 1. The first step: Put the wine stopper tightly on the bottle mouth, the wine stopper is suitable for most bottle mouths. 2. Step 2: Press the wine stopper up and down repeatedly until the date number can be seen in the small window on the surface of the wine stopper. 3. Step 3: Rotate to the current corresponding scale to record the storage date. 4. Step 4: Hold the stopper and pull it to one side. After hearing the sound of air flow, the bottle can be opened.