Stealth technology

Stealth technology was a type of equipment used by Starfleet in the 25th century. In 2404, Admiral Kathryn Janeway brought stealth technology with her when she time traveled to 2377 for use on the USS Voyager, so the ship could enter one of the Borg's transwarp hubs without incident. The stealth technology was later found to be incompatable with Voyager's systems by Seven of Nine.