This is an empty low profile subwoofer box for a 12" sub. It's super compact, great for behind a truck seat or in the trunk of a small car. It was sold as a package with the sub included: https://rockfordfosgate.com/products/details/p3s-1x12/ In inches: Height 13.5 Width 27.4 Depth1 5.3 - Depth 2 3.3 Internal Box Volume 0.60 ft3 (16.99L) Basically like new. I've only had it for less than a month.