Vast Coverage, Lasting Aroma: VEVOR's 850ml scent air machine covers spaces up to 100-4500sq.ft, filling every nook and cranny with delightful scents. Whether mounted on a wall or placed free-standing, it brings a touch of luxury and relaxation to your environment, promoting restful sleep and fresher indoor air. Upgraded HVAC Connection: Whether you're at home or in a commercial setting, our HVAC cold air diffuser ensures consistent and long-lasting fragrance coverage all over your room. It makes the scent fill room up to 100-4500 Sq.ft, creating a wonderful and relaxing ambiance for your bedrooms, bathrooms, office room, spa space. Natural, Healthy and Safe: VEVOR scent diffuser uses advanced condensing atomization technology to expand the fragrance and avoid dilution of essential oil by water, allowing you to enjoy the purest aroma. Different from the traditional aromatherapy machine, there is no need to add essential oil every day and clean the residual liquid every day. Customize Scents via Bluetooth: Once connected via Bluetooth, you can easily control power on/off, scent levels, timer function, and more. With 21 levels of diffusion concentration, you can tailor the fragrance concentration to your liking. Even when disconnected, it will continue to run according to the schedule settings. Quiet yet Powerful: Quietly and elegantly diffuse essential oils throughout your bedroom, bathroom, office, spa, or commercial space, creating a wonderful and relaxing ambiance. Let aromatherapy inspire and invigorate your senses, elevating your lifestyle with pleasant aromas. Note: To synchronize with your local time zone, please connect your smartphone via Bluetooth when using the device for the first time.