- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
Communications device worn in the ear by Starfleet personnel in the 23rd century, used to privately monitor audio transmissions or screen out surrounding noise if needed.