Reptiles and amphibians are cold-blooded and in their natural habitat they often use surfaces heated by the sun to warm up. The Exo Terra Heat Mat is a terrarium substrate heater that simulates these surfaces heated by the sun. Exo Terra's Heat Mats are an ideal 24-hour primary or secondary heat source for tropical or temperate reptile and amphibian species and essential as a nighttime heat source for many desert species. The Exo Terra Heat Mat permanently adheres to the terrarium, forming a solid bond for optimal heat transfer. Can be used with an Exo Terra Thermostat and/or in conjunction with additional heat sources for higher temperature species. Key Features  : Ideal for all glass terrariums For mounting under and on the side of terrariums Conductive heat source for reptile, amphibian, arachnid and planted terrariums Helps in thermoregulating - important for metabolism, digestion, appetite and activity Safe, even heat distribution Other Heat Mats available  : PT2015 - Exo Terra Heat Mat - 4 watt PT2017 - Exo Terra Heat Mat - 16 watt PT2018 - Exo Terra Heat Ma - 25 watt