Portable Essential Oil Diffuser Delta White can be used with a USB connection or batteries It diffuses the essential oils thanks to a system by ventilation Diffuse and changing colors. USB cable and 5 cotton refills included, batteries not included. Practical and nomadic, this Delta diffuser allows you to enjoy from the benefits of essential oils wherever you are and at any time of the day.By pouring a few drops of essential oils on the cotton refilled pad, your Delta diffuser will diffuse their benefits by means cold ventilation. It works on batteries and on USB. The diffuser creates soft light ambiance in your home with the effects of the changing colors.