Evapolar evaCHILL

It's an evaporative cooler: a fan draws air through a water-soaked cartridge, cooling and humidifying it. It doesn't use a compressor or refrigerant like a true air conditioner.

Only weakly. Because evaporative cooling depends on water evaporating into dry air, the cooling effect is strongest in dry climates and much weaker on muggy days, though it still functions as a personal fan.

It runs off USB power, so you can use a regular adapter, a laptop port, or a power bank. Power draw is only a handful of watts, far less than a window AC unit.

Yes, the evaporative cartridge is a consumable and typically needs replacing roughly every few months depending on use and water hardness. Regular rinsing helps slow mineral buildup in hard-water areas.