I start with the negatives, mediocre in terms of materials, be careful not to drop or hit it hard. Although it has several positives, the main drawback for many is that it makes a lot of noise, even on the lowest setting. If left on for hours, it will give you a headache since it needs to be placed very close, and it can be heard in the adjacent room...
It comes in several colors...3.7 - 5 volts...4 small LEDs depending on the setting, they turn blue when charging and when in use, pink when charging or low battery...it comes with a 18650 battery which definitely has a small capacity, around 1000mAh I would say, because it only lasts about 1 hour on the lowest setting...the one I got also has a small flashlight.
Although I got it last year at a much lower price (it didn't even cost as much as a pack of cigarettes), it still works this year with the heatwave. Sometimes I leave it plugged into a mobile charger for hours and I give it 4 stars because:
1- the cover opens easily and the battery can be replaced with another of the same type if you have or put in a better one, etc.
2- it can be connected to a power bank, there it will definitely last for hours of use because the smaller ones are around 4000mAh.
3- it can be connected to a mobile charger or laptop, etc. and it works even when the battery is dead and charging at the same time.
4- using the flashlight has served me well even though it has very low light, a simple LED from the 1990s. Many times I leave it on for 12 hours (at a time) in a small storage room with no light.
5- on the lowest setting, the small fan brings just the right amount of air as I want it.
6- on low battery, the small LED flashes.
7- it folds up