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