This is an ultrasonic humidifier. Working condition confirmed in the second photo. 4 liters For wooden structures: 2-5 tatami mats For reinforced concrete structures: 6-10 tatami mats There are no stains or scratches, but there is some dirt in the area shown in the 9th photo. Since there is no box, the instruction manual will be included and the item will be wrapped in packing material for shipping. Made by Kishima Co., Ltd. KNA88070 Compatible with aroma essential oils. Aroma oil was only used once, and it has been used with water only since then.