The Exo Terra Heat Wave Rainforest Terrarium Substrate Heater simulates the heated forest floor of tropical areas, In tropical areas or rainforests the sun is often blocked by trees, and clear skies alternate with cloudy conditions, Because of its climatological conditions (heavy rainfall combined with high humidity levels) the soil or substrate never heats up to the extremes like those experienced in desert environments, The power of the Exo Terra Heat Wave Rainforest Terrarium Substrate Heater is balanced to create these conditions in the terrarium as well as providing safe, even heat distribution, Easy to install, the Exo Terra Heat Wave Rainforest Terrarium Heater can be mounted under the terrarium or on the outside terrarium wall, The Exo Terra Heat Wave Rainforest Terrarium Substrate Heater Features and Benefits:, - Ideal for humid or rainforest, - For under tank or tank wall mounting, - Perfect for bottom dwellers when mounted under the terrarium, - Perfect for tree bottom reptiles when mounted on the back or the sides of the terrarium, - Conductive heat source for reptiles, arachnids and amphibians, - Helps in thermoregulating- important for metabolism, digestion, appetite and activity, - cUL approved, - Safe, even heat distribution, 10"" length x 11"" width SKU: RCHG1053