Aromatherapy uses naturally extracted aromatic essences from plants to promote the health of body, mind and spirit. It has been used for centuries to reduce anxiety, relieve stress, ease depression, increase energy, boost memory, speed up healing, induce sleep, ease pain and more. Simply add a few drops of your preferred oil (sold separately), and enjoy the therapeutic benefits of aromatherapy. Compact and portable diffuser covers an area up to 100 sq. feet. Runs on 2 "AA" batteries (sold separately), USB cord or wall adapter. Plastic. 4"L x 3 1/4"W x 2 1/2"H.