According to the patent application, the miniature device could contain and sustain fusion reactions capable of generating power in the gigawatt (1 billion watts) to terawatt (1 trillion watts) range or more.
https://www.forbes.com/sites/arielcohen/2021/02/08/what-is-behind-the-us-navys-ufo-fusion-energy-patent/?sh=1aed81714733