Who puts text in icons? Logitech.
Those "Setup Guide (PDF)"s all link to different documents…
…and here they are, so I don’t have to go through the nonsense that is Logitech’s website, again.
zone-wireless-plus-receiver-web-qsg.pdf (1.8 MB)
zone-wireless-plus-replaceable-earpad-covers-web-qsg.pdf (1.9 MB)
zone-wireless-plus-charging-cable-qsg.pdf (999.8 KB)
web0268zonewirelessqsgamr.pdf (1.4 MB)