The "sonic device" was a highly lethal weapon employed by the Hands of Blue. It was small enough to be carried in a coat pocket and when activated caused massive internal bleeding from generally every orafice and opening, even under finger nails and sweat pores, in the human body. The activated weapon emitted an increasingly high pitched tone and as the tone grew more intense, the injuries sustained by nearby targets became more and more grave. The weapon functioned with a broad area of effect and spared only those who were immune to its effects (those employing the weapon) and those who were too far away. Its use appeared to be to remove all inconvenient potential witnesses. No one within several feet of the user would die from the devices effects, making it difficult for others to harm the user.