Thank you for viewing. [Product Description] roomist Plasma Ion Humidifier by Mitsubishi Heavy Industries Air-Conditioning Systems Hybrid Heating Vaporization Humidifier. - Brand: roomist Mitsubishi Heavy Industries Air-Conditioning Systems - Features: Plasma Ion function [Condition] I used it a few times when I first bought it, but it has been in storage since then. I cleaned it as much as possible before listing it, and confirmed that it works well. I will include a printed copy of the instruction manual downloaded from the manufacturer's website, so I think you can use it right away. Thank you.