Product:
The volume is bearable.
The power consumption is relatively low, at a 5000mA Power Bank it took two hours until the battery was empty.
The air passage is very good for a USB fan under 10EUR.
The device is currently running about 8h, a day to disperse the exhaust of my computer, this is not needed for me the on / off switch.
The cable is useful with about 1.25 m, but not unusually long.
The fan is to use both excellent at the USB port of your TV, a computer and a USB adapter.
Conclusion:
Buy !! But bear in mind that it is powered by USB and costs under 10EUR.