Evaporative cooling: It uses a water tank and mist/ultrasonic atomization system. Water evaporates as air passes through, lowering the temperature and adding humidity for a cooler breeze (best in dry/hot environments). You can add ice or cold water for extra cooling.
• Rechargeable battery: Typically features a 12V 4800mAh (or similar) battery for cordless use during power outages. Runtime varies by model and speed (e.g., ~14 hours on low, 6 hours on medium, 4 hours on high for larger models). Some claim longer runtime with a full charge.