An EMF pump is a portable, battery-operated device designed to emit a steady stream of electromagnetic energy into its surroundings. Paranormal investigators use it to flood an area with EM fields, operating on the theory that spirits may rely on this energy to manifest, communicate, or interact with their environment. By boosting the ambient electromagnetic field, the pump may help create conditions conducive to unexplained phenomena—such as sudden temperature changes, movement of objects, or spikes detected by EMF meters. While it doesn't summon spirits, it serves as a potential energy source for any entities that may be present.