When you say blowing cold air, can you feel the wind obviously? If so, it is that the negative ion health instrument itself is equipped with a fan device. Due to technical limitations, the negative ions produced by this negative ion health instrument have large particle size and low activity, so it must be driven by a fan to reach a long distance. Without a fan, negative ions can only be detected around the machine 1 meter.
At present, only the negative ion health instrument running nano-fullerene negative ion releaser and ecological negative ion chip technology can form a real negative ion bath environment at 4-5 meters, independent of wind power. Due to the small particle size of negative ions produced by this negative ion health care instrument, it is easier to penetrate the blood-brain barrier of human body and play the therapeutic role of negative oxygen ions on insomnia, three highs, asthma, cancer and so on.