Zojirushi Steam Humidifier EE-RK50, manufactured in 2015. Used for about 3 seasons and then stored at home. I performed citric acid cleaning as frequently as instructed in the manual, so there is little discoloration inside. There are some minor scratches and dirt, but I think it's a fairly clean item. Please search for the model number "EE-RK50" for detailed specifications. Thank you!