Manager Zhang is a filial son. Having heard that negative ions can improve sleep, he bought an “八千八”  brand negative ion air purifier for his elderly mother. Just three days after using it, he contacted the manufacturer's after-sales service and said that it had indeed improved his mother's sleep. However, he also raised a point. Although the noise was the lowest when it was set to the lowest gear, he still thought it was a bit noisy. He suggested adding a gear that only activates the negative ions without turning on the fan.

The customer service gave him some suggestions: 1. Place the negative ion purifier about two meters away from the bed. 2. Put a piece of cloth under the negative ion purifier when using it to reduce the noise.

Of course, Manager Zhang's suggestion was also fed back to the design department, which thought it wouldn't be difficult to implement. The company decided to produce a batch of models in the future where the lowest wind speed is 0 while the negative ions are already on. These will be provided to old customers with the same requirements as Manager Zhang, either for replacement or at half price.

The latest news is that Manager Zhang bought a knitted cover with a hollow-out pattern for the negative ion air purifier. The noise has been reduced a great deal, and his mom is very happy. Then, he bought another one for his daughter's room. Naturally, he also put one in his own bedroom. The “八千八" brand negative ion air purifier with the knitted protective cover really looks great.