The Crawl Space Vent Cover is a black plastic cover designed to fit an 11" x 18.5" opening in a crawl space. It weighs 1 pound and comes with mounting screws for easy installation. The product does not require batteries and has dimensions of 18.75 x 11.25 x 1 inches. Manufactured by Inc., this vent cover helps regulate heating, cooling, and air in your home, providing a secure and efficient solution for your crawl space needs.