Use Vicks Portable Waterless Diffuser to get an easy breathing sensation from diffusing the essential oils into the environment without using water. Benefits of the Diffuser: Portable USB powered device, light and easy to carry when travelling. Versatile use - perfect for the bedroom or office. Use VapoPads for extra comfort - the quantities of essential oils in each pad have been tested, so that you know you are using the right amount for you and your family. Each pad can release up to 8 hours of soothing vapors, allowing a full night of rest.