Reduces oxidation that can spoil leftover wine. Place Vintage Vac on neck of open wine bottle to activate battery operated pump. As the air evacuates the vacuum indicator button on top goes down. Indicates wine temperature in °F and °C. Press the Vintage Vac button on front to release the seal. ABS plastic body. Silicone seal gasket. 3-1/2" high, 2-3/8" dia.