2 IN 1 MODE USE:Patended Designed with built-in timing or USB humidity controller. This reptile humidifier uses intermittent timing principle to set the spraying frequency, interval time and spray duration for repeated periodic humidification without USB. It can also detect the humidity level in the terrariums and work according to the set humidity range with USB. Minimum & maximum setting value, current temperature, and current humidity value are displayed clearly on the large LED screen. ULTRA QUIET PUMP & ADJUSTABLE MISTING:The reptile humidifier/fogger works very quietly, providing a comfortable environment for your reptile pets. Misting level can be adjusted with 100ml, 200 ml, 300ml per hour and the tube can extend from 1.3 to 5.3 feet. The suction cups help you fix the tube to the spreading direction freely. 4L TANK & DRY-OUT PROTECTION:The reptile fogger/humidifier with 4 Liters large tank allows 12 hours or more of working time in max misting level(300ml/per hour). When water runs out, the reptile fogger will shut down automatically to keep security.