Creative aromatherapy humidifier USB car charger. Refresh air, sterilization and purification. It can increase humidity of air, reducing dust and bacteria. You can drop the aroma oil into the water to make the air fresher. 2 hours power protection, auto-off after 2 hours. Compact and portable nebulizer for travel, and on the way. Purified water is highly recommended as unfiltered water would block the vaporizer. Water soluble essential oil are preferable. Please DO NOT use greasy aroma oils You might need to wait 3-5 mins to get the mist when you use the item in the first time. You need to wet the cotton sponge first, if not, car diffuser can not work properly. Size: 6.5×8 cm/2.56×3.15in (Approx. ).