The Exo Terra Heat Wave Rock simulates a stone heated by the sun. Various reptiles, including nocturnal ones, use this form of conductive heat for thermoregulation. The Heat Wave Rock automatically shuts off when a certain surface temperature is reached to prevent burns or overheating. The heating element in the stone is fully encased, preventing hot spots. The special thermal conductive resin is waterproof, non-toxic, easy to clean and ensures even heat distribution.