Handheld electronic wine vacuum cork. Battery powered device (uses 2 x aaa batteries - included). Automatically removes air from opened bottles of wine once it is placed on the neck of the bottle. Countdown feature lets you know how much time is left until air is evacuated. Pressure release button allows you to easily remove vacuum cork when ready to serve. Built-in thermometer with blue lcd displays the wine’s temperature (degrees can be displayed in either celsius or fahrenheit).