This is the high-power type of O-Rela. The new price at the time was 320,000 yen. - Corona silent discharge method - 40 million negative ions - Applicable area: 150 tatami mats - Power consumption: 15W, estimated electricity cost (for one month of operation): about 150 yen - Power supply: AC 100V-240V (50/60HZ) It has been installed in university hospitals, nurseries, nursing care facilities, and agricultural facilities. For other details, please see the manufacturer's website. https://www.o-rela.com/product This is a used item. Please check the images and consider purchasing.