The Aroma-Acecomes with a five year warranty and is manufactured in the USA. This workhorse is the diffuser of choice for many certified aromatherapists. Change essential oils in seconds with the innovative quick change system. Simply twist a new bottle of essential oil into the atomizer at any time without mixing or spilling. Advanced, built-in, easy-to-use timers provide exceptional operational control and convenience. State-of-the-art Cold Diffusion technology preserves the natural essence and complete therapeutic benefits of essential oils by effectively transforming them into a micro fine vapor without the use of heat or water. These micro particles permeate the air and remain suspended for hours, fully intact, with all of their NATURAL defenses against airborne viruses, bacteria, mold, pests, and odors.