Easy to clean" "Natural look" "Promotes natural behaviour" "Facilitates digestion" "Electronically-controlled heating element" "Even heat distribution" "Fully-encased element" "Energy efficient" The Heat Wave Rock automatically shuts off when a certain surface temperature is reached to prevent burns or overheating with the thermostat.The fully-encased electronically controlled heating element covers the stone,prevent hot spots.The special thermal conductive resin is waterproof,non-toxic,easy to clean and ensures an even heat distribution. Natural looking Heat Wave Rocks are avalilable in three sizes and are easy to integrate in any terrarium set-up;humid or dry.