This is a hybrid humidifier from Dainichi Plus. Please check the photos for the condition. The filter was replaced last year, but it has yellowed as shown in photo 5. If you are concerned, you can purchase a new filter yourself. - For wooden rooms: 8.5 tatami mats, Prefabricated rooms: 14 tatami mats - Humidity setting available - Throat and skin humidification modes available - Eco, quiet, and standard modes available - Child lock available Operation has been confirmed. There is no instruction manual. It will be shipped directly in the cardboard box shown in photo 12 with the shipping label attached. Thank you for looking.