Click Link Below: http://petdiscounters.com/small_animal/reptile/maintenance/im_tropic_aire.html 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. We have successfully used a similar device for several years with our hermit crabs. For use with up to a 55 gallon tank. Unit sits external to the terrarium, so it can be easily hidden from view. Only the thin output tube sits inside the tank. To use, you simply fill the humidifier tank with water to the fill line. The sponge inside the tank will become moist and saturate the air above the water. This fresh, humid air is then pumped off into your terrarium. (Click on the image on the right to see a larger view.) Uses a standard aquarium air pump, which must be purchased separately. 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. . (In other words, choose a bigger pump for bigger tanks.) Each unit stands approximately 12" tall with a 4" x 4" footprint. Includes the humidifier tank and cover, (2) suction cups, output nozzle with 4 air outlets, humidifying sponge, air diffuser, and air supply tube. Note: For this unit to work properly, your cage must have a glass or plastic top to retain moisture. Screen tops will allow all of the moisture to escape out to the surrounding room and may not allow the humidity level of the tank to rise.