I received this at an event. It's new and unused. * With the power of negative ions and low-concentration ozone, it can decompose and suppress invisible viruses, house dust, and unpleasant odors and bacteria in the room. * It not only removes dust and pollen but also creates a healthy and relaxing space by generating negative ions, which are abundant in nature, such as in clear forests. * It's silent because it doesn't use a fan or motor. * 【2-Stage Mode Switching】You can switch between normal mode (6 to 10 tatami mats) and economy mode (5 tatami mats or less) depending on the size of your room. * 【Removal of Airborne Viruses】Experimental results show that 96% are suppressed in 5 minutes and 99.9% in 15 minutes. (※ The concentration of airborne viruses was measured before and after operation in a 200? test chamber.) * 【Mold Removal】99.9% removed in 1 hour (※ The concentration of airborne viruses was measured before and after operation in a 200? test chamber.) * 【Deodorizing Performance】Compared to natural decay, methyl mercaptan is reduced to 0% in 30 minutes, hydrogen sulfide is reduced to 46% in 30 minutes and 16% in 60 minutes, and ammonia is reduced to 88% in 30 minutes and 70% in 60 minutes. (※ Each component of methyl mercaptan, hydrogen sulfide, and ammonia was measured individually with a detector tube in a 27? acrylic container.) * 【Electricity Cost】Even if left on 24 hours a day, it costs about 3.3 yen per day, about 99 yen per month (※ Calculated at a general consumer household electricity rate of 27 yen/kwh.) * 【Economical】Maintenance is as simple as wiping the electrodes and dust collection plate. There is no need to purchase replacement filters, which require effort. It is economical because it generates low-concentration ozone with electricity without using chemicals.) * 【Lightweight】Compact, so it can be placed anywhere and is stylish (approx. 20cm wide, 10cm high, 10cm deep) It's palm-sized, so it's portable and weighs about 500g (about the weight of 2 apples). * 【Almost Silent】It's almost silent because it generates negative ions using the discharge technology of a spacecraft. It's ideal for bedrooms and children's study rooms. I am an amateur, so please understand that no claims or returns are accepted.