I came across this piece that was interesting:
STAR TREK: VOYAGER "BODY AND SOUL - ALIEN MEDICAL INSTRUMENT"
A prop medical instrument featured in the Star Trek: Voyager episode “Body and Soul” where “Seven of Nine” (Jeri Ryan) had to download “The Doctor’s” (Robert Picardo) program into her cerebral net to escape detection by “holophobic” aliens. The item is in the style of the Starfleet hypospray, resin cast with metal accents, a blinking red light on one end and a stroking orange on the other. It measures 6 X 1.5 diameter inches.
Is this listed correctly? It looks so much like a TOS earpiece with the finned cylinder and the angled head piece, that it seems more than coincidence. Was it originally created as an alien earpiece and repurposed, or is the description of its use in the episode wrong? Does it appear in any other episodes?