Heat Wave Rock (large) Heat - Wave Rock (Large) Click to enlarge Unlike other Hot Rocks on the market these have a built in thermostat to prevent overheating and the risk of burns. ? Easy to clean ? Natural Look ? Promotes natural behaviour ? Facilitates digestion ? Electronically-contr olled heating element ? Even heat distribution ? Fully-encased element ? Energy efficient The Heat Wave Rock simulates a stone heated by the sun (in nature, even after sunset, stones maintain some heat for several hours). Various reptiles, including nocturnal, use this form of conductive heat for thermoregulation which is important for metabolism and digestion. The Heat Wave Rock automatically shuts off when a certain surface temperature is reached to prevent burns or overheating. The fully-encased electronically controlled heating element covers the stone and prevents 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 available in three sizes and are easy to integrate in any terrarium set-up. NOT SUITABLE for humid inviroments. MUST NOT be placed directly under spot/heat lamps or on top of heat mats but also must be placed in the vivarium in such a way as to still leave a cool area. With the large Heat Wave rock only being 15W power output it will not be suitable as the sole heat source in many reptile setups. Size: 31cm x 18cm