The term "full range" can have different meanings depending on the context in which it is used. Generally, however, when referring to a set or collection of things, "full range" means everything that is included within that set or collection, without any missing elements or parts.
In other words, if something has a full range of features or capabilities, then it possesses all the necessary components and functions required for it to operate at its maximum potential. For example, a speaker with a full range driver can produce sound over an extended frequency spectrum, from low-frequency bass tones to high-pitched trebles.
In summary, "full range" refers to having everything that is needed or desired, and being complete in all aspects.