This pet cage heater provides two safe and easy to ways to set up and mount. The heater provides a variety of animals with the proper heat. The heaters have been dialed in to ensure that whatever pet you have, it will have the best basking heat for its needs. Attaches to exterior of cage with mounting screws (included). Can be mounted on the cage side or cage roof. Heater size - 6.5 inch x 4.5 inch x 2 inch thick. Heat Ceramic heating element is specially designed to produce and radiate the proper amount of heat for most reptiles. The internal microcomputer controls the temperature with precision, ensuring that your pet gets the exact amount of heat needed to be healthy. Never too much and always just right, when used as directed. Mounting Dual mounting options guarantee that you have the most secure attachment for your ReptoHeat regardless of the set up you have. Dual Mode Two modes guarantee you can properly heat your pet. As your pet grows its environment may grow too. The Hi and Lo setting ensure you can not only heat a variety of cages, but a variety of environments as well. Market for the reptile trade, this heater works well in most wire cage environments and can be used for many small mammal cages too.