This is the "PIERIA Ultrasonic Humidifier" from Doshisha Co., Ltd. Model number: "DKW-2140" Tank capacity: "400L" It's an "easy top-fill" type that allows you to easily add water from the top. I think refilling is really easy and convenient. Also, it's designed to be easily disassembled and cleaned thoroughly. It has various functions such as adjustable humidification levels, auto mode, humidity display, humidity sensor, and off timer. I used it at home a year ago, and then cleaned and stored it. However, I'm going to buy a larger capacity one this year, so I'd like to give this one away to someone. Please refrain from purchasing if you are sensitive to used items, as it has been stored at home. While cleaning to remove limescale stains, as shown in the last photo, some of the paint on the black internal parts has peeled off. Please check the photos before considering a purchase. As of 2025.10.25, I have confirmed that it powers on, as shown in the photos.