Aiicioo Under Tank Heater are an ideal 24-hour primary or secondary heat source for tropical or temperate reptilian species. It contains a high level nichrome heating wire and great PVC material to insulation which can provide gently and durable warmth for reptiles and amphibians. Reptile heating pad permanently adhere to your terrarium or incubator, forming a solid bond for optimum heat transfer. Reptile heating pad can be placed underneath the tank or on the side of the tank depending on your set up. The Reptile heating pad should be placed on the outside of the tank only. If you choose to place the heater on the underside of the tank, be sure to elevate the tank slightly using the included "bump-on feet" or another method to prevent heat encapsulation. Please be sure to read the instructions carefully.