Fragrance Machine: 1. connect large ventilation system or air condition system. 2. Can set different working period and can regulate the concentration 3. Scent work(every fragrant work time):10 to 300s.Press up or down button can adjust 5s. 5.scent pause(every fragrant interval time):10 to 300s.Press up or down button. 4. Usually for hotel,shopping plaza and so on. Widely use: Aromatherapy Diffuser converts the scented oil into the gas form and diffuses evenly in the desire areas. It not only masks the unwanted odor problem but purifies the indoor air quality with its fragrance diffusion system. Hotel Lobby, Restaurant & Bar, Pubs & Nightclubs, Gaming & Casino, SPA & Fitness Clubs, Cinemas & Auditoriums and Hospitals can now have their ambience smell like peeling fresh orange, chocolate cream pie, crisp green apple, luscious fragrance of sweet coconut, distinctive aroma of freshly cut grass, pleasant green tea aroma and many more.