The prisoner's bark of surprise sounded more like a squeak over the helmet communicator.

Uhura's quiet voice emerged from the suit's helmet communicator, close as a whisper in his ear.

Yalson spoke into her helmet communicator, looking at the Changer.

One of the guards chatted code into his helmet communicator.

"Uhura," Kirk said, "can you link my helmet communicator to this one right here?"

"He just beamed out," Kirk said into his helmet communicator.

He cut his helmet communicator and sighed: A milk run, he thought.

He could only keep track of their progress via their helmet communicators.

The helmet communicator was still engaged so the crewmen had heard everything that was going on.

"Security detail, report," Valak said, speaking into his helmet communicator.