There are some influences. Its name is "health care", in fact, health care is not easy to say the size of benefits.

To test the content of negative ions, a negative ion tester is needed. CCTV 2 says "at your service".

The concentration of negative ions can reach per cubic centimeter 1000, and there are some functions. Now the icon floor releases more than 900 negative ions per cubic meter.

Ps: Landlord, if the price is higher than 200, I suggest you reconsider.