Xiao Zhao works in a design and research institute in Zhuhai. A week ago, she started using an “八千八” brand negative ion air purifier on her office desk. She said that in winter, the office is relatively cold. Although the air conditioner's heating function hasn't been turned on yet, the windows aren't opened as wide as before, so she feels that the air in the office isn't as fresh as it used to be. She placed an “八千八” brand negative ion air purifier on her desk, and her colleagues all said it looks nice. Colleagues within two meters around also felt that the air seemed a bit fresher. Xiao Zhao said that the negative ion air purifier gets power from the USB port of her computer. Placed 50 centimeters away from her computer, it makes the air feel fresher and improves her work efficiency. Before, she often had a stuffy nose, but since she has been using it continuously for a week, the situation has improved a lot.