An Asgard invisibility device is a small hand-held cloaking device used by the Asgard. When the device is applied to the body of an individual and then activated, the person becomes invisible. This device was used by the people of PX3-595, an Asgard protected planet, to hide from predators. It is unlikely that this device blocks people from sensors, although it does block scent and sound, however, because the Asgard would want to limit their technology given to the planet to the minimum necessary.