Klappbarer 3-in-1 Handventilator mit Digitaldisplay

When increasing the wind speed or at a specific wind speed (in my case, 130 rpm), there is a loud fan vibration sound similar to high frequency noise.
After using it for a while, I realized that the problem isn't the wind noise, but the high-frequency vibration sound mentioned above is very annoying. It seems like there might be a lubrication issue or a mistake in assembly.
In terms of cost-performance ratio, it's excellent, but the overall quality feels lacking.

Foldable 3-in-1 Handheld Fan with Digital Display

The best~~~

I bought this handheld fan because it has a powerful 8000mAh battery and a powerful Turbo Fan.

However, it is not a strong Tubro Fan wind at all.

Moreover, the wind is not blowing straight forward, but spreading out to the sides.

I bought many different handheld fans from AliExpress, but this one has a weaker wind than those priced at $3 to $5.

I'm completely disappointed.

Stop the false advertising of this powerful Tuubro Fan!! !

It's good, the battery life is ample and the manual analog control is nice, but it's a bit heavy to wear around the neck.