About the product Natural Bamboo Design Offers Safety and Health - This essential oil diffuser was crafted with exotic bamboo outer shell and food grade PP material water tank. 2 Working Modes - Continuous Mist/ interval Mist(30/30seconds)/OFF. It will run 3 hours on continuous mist mode, 8 hours on interval mist mode. Waterless Auto Shut-off Function - Giving enough easement for a Long Time. When you are sleeping or out, it will auto shut-off if the water runs out.