Bio-Dampener

A bio-dampener is a small device developed by Erin and Magnus Hansen that cloaks the lifesigns of the person wearing it by creating a field around the body that simulates the physiometric conditions within the person's environment, such as a starship. Essentially an electromagnetic version of camouflage. Magnus used the device to board a Borg cube undetected while conducting research on the Collective in the 2350s. Each unit has to be tailored to its user's physiology. The crew of USS Voyager then used them to try and get a transwarp coil from a Borg ship, as part of Operation Fort Knox. The Borg did not seem to have adapted to the technology. (VOY: "Dark Frontier")