The Master of Wine vacuum stopper removes air from the bottle without your participation - you just need to correctly and tightly install it on the neck and press the button - the device will automatically pump out the air until a vacuum is reached, after which it will stop. The stopper will help keep the taste of the drink fresh so you can enjoy it over the next few days. This model is designed for still wines. If the device detects that air has entered the bottle during storage, it will automatically pump it out again to a vacuum state. The battery indicator shows the level of charge so you can replace the batteries on time. The indicator in the form of three arrows indicates that the bottle is securely sealed and does not contain air inside. - protects wine from de-gassing throughout the sealing time, pumping out air when necessary - for red and white wines - instruction manual in Russian included - charging and vacuum indicators - comes in the brand's signature packaging - design continues the overall style of Master of Wine, can be combined with other brand products to create a set - made of human-safe materials that do not distort the taste, color, and aroma of the drink Powered by two AAA batteries, not included.