"A large battery and low price offset by suspect noise claims and cheap motors."
The "6000mAh battery" provides a genuinely long runtime for the price, but the "less than 25dB" noise figure is marketing fiction for any setting that actually moves air.
This is for the buyer whose top priority is maximizing runtime at the lowest possible price for long days outdoors. If you see '6000mAh' and '$25' and consider the deal done, this fan is built for that calculation.
Anyone sensitive to noise should disregard the advertised decibel level, as it is not credible. Users wanting proven durability or a truly quiet device should invest in a higher-priced model from a more reputable brand.