A wireless speaker is most of the times NOT entirely free from cables. When talking about a wireless speaker, we refer to the communication of music from the source to the actual speaker. This can for example be sent via bluetooth from a phone to the speaker.
The wireless speaker still needs a power cord (if it is not battery powered) and if it is a pair of stereo speakers, there will be a cable between the two speakers.
So a bluetooth speaker with battery is a truely wireless speaker.
Addon C3 - battery powered bluetooth and wifi speaker. Truely wireless.