The Exo-Terra Ultrasonic Fogger, PT2080 generates a cold mist in all types of terrariums. The Exo-Terra Ultrasonic Fogger is ideal for increasing humidity levels and creating a natural misty and damp environment. Operates in any water part (e.g. Exo Terra Water Dishes,Waterfalls,etc.) as shallow as 5 cm! Increases air humidity levels up to 100% Great visual effect Simulates low clouds and fog in the tropical terrariums, also Generates early morning dew in desert terrariums.