Hello. Sharp IG-LTA20-W Ion Generator, Ceiling Mount Type. I am selling this due to a change in environment. As shown in the fifth photo, the red lamp is on, and this lamp indicates it's time to replace the cartridge. I have been using it without replacing the cartridge, so I am selling it as junk. As shown in the second photo, the filter is dirty and could not be cleaned. #Sharp #IonGenerator #HumanSensorLight