The type of spaceship by which the Invaders reach the Earth is a flying saucer of a design derivative of that shown in the contestable early 1950s photographs of self-proclaimed UFO "contactee" George Adamski, but instead of having three spheres on the underside, the Invaders' craft has five shallower protrusions.
They use a small, handheld, disc-shaped weapon with five glowing white lights applied to the back of the victim's head or neck to induce a seemingly-natural death, which is usually diagnosed as a cerebral hemorrhage.