Sharp IG-DK1S High-Density Plasmacluster 25000 This is a desktop-type Plasmacluster ion generator. - The ion generation unit was replaced with a new one in 2023. - Includes one new humidifier filter. - Can be charged with either AC power or USB. I plan to clean it as much as possible before selling, but there may be some minor dirt, water stains, and signs of use. Please understand this before purchasing. If you have any questions, please feel free to ask.