Aroma Diffusers Are Fragrance Dispensers For Residential. Commercial And Industrial Applications. Aroma Diffusers are made from ABS plastic, poly propylene, and Zinc to provide long lasting durability. Essential oil slowly releases from refillable fragrance botle (included) to freshen warehouses, basements, homes, stockrooms, and more. Scent coverage is 150 or 250. Heights are 3.5" and 8". Available colors include White, Black, Metal, Lime, and Bronze. Aroma Diffusers work with Relax, Revive, and Refresh essential oils. Diffusers use rechargeable battery with included USB cord. Other dimensions vary per style.