STRONG and SOLID - aluminum alloy shell that is heavy, Sleek, slender look for any room in the home or office. NO WATER NEEDED - unique system making this machine water free allowing better scenting coverage. POWERFUL LONG-LASTING DIFFUSER: This essential oil diffuser is powerful easily filling a space with fragrance.HVAC Capable - multiple type uses, including pieces to hook it up directly to vent system HVAC. QUIET: The noise from our diffuser is under 42dB so will effectively blend with the ambient noises in your surroundings, creating a unique and inviting ambiance in your home. PCB DISPLAY - set your concentration, hours and days timing digitally with the touch screen PCB. Large Smart Scent Diffuser for Average Size Rooms PCB Display Water Free. Per hour Bottle Capacity: 500 ml. Feedback is very important to us. It is impossible to address issues if we do not know about them! Faction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it's non-workdays, please kindly be patient and wait till Monday. The item "HVAC Essential Oil Nebulizing Diffuser Air Scent Machine for 3500-7500sf Area" is in sale since Wednesday, July 28, 2021. This item is in the category "Home & Garden\Home Décor\Home Fragrances". The seller is "honestdentalshop" and is located in Chino, California. This item can be shipped to United States.