This product is a complete kit, containing invisible powder, brush and a UV light. Invisible Fluorescent Thief Detection Powder is applied to a surface such as a doorknob or a valuable object. It is applied lightly with a brush. When your thief touches the object, the powder transfers to the skin and remains invisible until inspected under UV light. The Fluorescent Thief Detection Powder will glow brightly under UV light and will easily identify your thief. Includes a brush and a UV light.