This is a food preserving storage chamber that is able to pump out air in the container and maintain a vacuum environment and reduce the moisture for preserving food. It’s powered by AC or 4 D batteries. No word on the precise size.
You can get the Food Preserving Storage Chamber for $69.95 USD at Amazon. I feel a bit expensive about a food chamber, but to somebody, it’s really practical. BTW, if you need a more advanced option, you may like to check kSafe smart safe that costs $79 (the price for preorder).