It is unused but has been opened and is missing the instructions.

The cable for the speaker has started to deteriorate with age and has become brittle and sticky. It is a simple mono speaker with a standard Jack connector and replacements which are virtually exactly the same are plentiful on eBay if you search for CB speaker.

As the instructions are missing I can not confirm if is 100% complete but by comparing to other listings it does all seem to be there.