Rechargeable fans are portable cooling devices that operate on battery power, allowing them to be used without a direct electrical outlet. They are ideal for outdoor activities, camping, or during power outages. Many models come with adjustable speed settings and can run for several hours on a single charge. These fans often feature lightweight designs and built-in handles for easy transport. Some rechargeable fans also include additional features like LED lights or USB ports for charging other devices. They are an energy-efficient alternative to traditional fans, making them popular for both personal and environmental reasons.