Car Air Humidifier and Aromatherapy Essential Oil Diffuser (PURPLE) 3 in 1 functions: Humidification & Aromatherapy & Purify Through diffusing water mist, it can increase air moisture and removes the dust in the air molecules. With a 25ml Humidifing Capacity per Hour, it's Enough to Change the Car Microenvironment and Meet Your Needs. The 2-hour Automatic Shut-off Prevents Potential Harm from Running without water Press the button to change the mode ,humidifier and Essential oil Diffuser(Works with ordinary tap water, plus 2 to 3 drops of essential oil ) Only ship from N.choice, if you buy from other store,they are fake and poor quality, you can request a refund