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1) Adopts negative ion technology: it extremely purifies the air and removes toxic substances including the dust and odors mold 2) Broad spectrum and efficient ozone: ozone may kill virus, and will be deoxidized into oxygen in the end without secondary pollution, which the chemical agents can not achieve 3) Effective prevention of air-conditioning diseases: negative ions may improve metabolism. It maintains a fresh air, relieves fatigue and effectively prevents the diseases arsing from the air conditioning 4) Automatic timed sterilization: automatic timed operation of ozone, 15 minutes after startup, one time of sterilization is finished and the machine is shut down automatically