Experience a personal aromatherapy session at the office, home, even in your car* with the PureGuardian® Aromatherapy USB powered essential oil diffuser that conveniently plugs into your computer or any USB port. Simply add a few drops of your favorite essential oil to the absorbent pad that is included and you will quickly notice the natural aroma. The diffuser includes an additional USB port so devices can still be charged simultaneously. It's compact and portable, making it great to use while traveling for business or sitting at your computer studying. No batteries are required and it includes 5 absorbent pads. PureGuardian Replacement pads and oils sold separately.