Under normal circumstances, the ring he used would have a designated triangle symbol stating which Trimadian fleet the operator belonged to. On any covert mission, the ring was plain so as not to arouse suspicion if found by an enemy. In Manutaais case, it was only designed to signal Taloktas domain ship, but he had modified it so he could contact anyone he wanted. Sataal did not have all the brains!
When he was back on board Taloktas ship, the ring would be simply readjusted back to its original settings, and he would return it to the ships communications center, as being standard protocol.
All his plans were water tight, except for the fact Marone had not shown up.
Manutaai was debating whether or not to use the ring again before the communications center got suspicious. Telling them he had lost the ring would not look good.