Compact and quiet the Aroma Sphere is easily portable for aromatherapy on the go! Power on with the convenience of batteries or with the included USB cord. Add your choice of essential oils to the absorbent pad and enjoy. BPA Free Plastic Run Time: Continuous Operating Modes: Continuous/ Off Light Mode: N/A Power: By AA batteries (not included) or USB cord Coverage: Up to 100 sq. ft Included: 3pc Refill Pad and USB Cord Dimensions: 4 x 4"