Designed to create a healthier environment for reptiles and amphibians from tropical and subtropical regions. This unique device constantly supplies your terrarium with fresh, humid air. Eliminates the need for hand spraying, except when needed for dew licking animals. For use with up to a 55 gallon tank. Uses a standard aquarium air pump, not included. When choosing an air pump, choose a model that produces enough air for an aquarium that is the same size as your terrarium so that the air in the terrarium is exchanged once every hour.