This Mini refridgerator air purifier (Duion unit) produces both positive and negative ions.It is unique, in that it has several functions. It not only cleans the air but it removes both smells and odours, kills bacteria, as well as slowing down the ripening process of fruits and vegetables. The negative ions react with the positive ions to form active oxygen and negative ions. This reaction causes a natural breeze that circulates the output into the surrounding atmosphere. Functions and Features Maintain all types of vegetables, fruits and food 3 times longer by slowing down the ripening process. Keep all types of meat, fishand food freshby killingbacteria, viruses, germs and mould Neutralize smelly odours and food smells in the fridge. Sterilizing, oxidising and disinfecting harmful bacteria, viruses, germs and mould. Provides a Clean Environment inside the fridge. Smartest patenteddesign Electronics encapsulated, so moisture is not a problem.Specifications: Anion output: 3mn pcs/cm³ Active oxygen output: 10 - 12mg/h Ozone concentration: <0,03ppm at 10cm Output Grid voltage level: Zero volts Input voltages: 12VDC (Optional: 230VAC, 5VDC) Input power:< 1W Working Temperature: 3-55 deg C Storage Temperature: 5-60 deg C