The universal 18” rechargeable fan has dual functionality; it operates with electricity while charging itself at the same time. So when power goes off, it won't stop working, it switches to battery mode and continues working for several hours. You are assured of fresh air all day long. It is very reliable and efficient. This rechargeable fan was made with your comfort in mind. Like they say necessity is the mother of invention. We live in a very hot climate with epileptic power supply, so it became a necessity to have an innovative that product will provide us with fresh air round the clock for our comfort in such a harsh weather condition. This prompted Haris to take the bull by the horn and design an affordable rechargeable fan for everyone. The 18” rechargeable fan works up to 7 hours without power, enjoy a night of sleep with fresh air, no more complains about heat. You can use this fan indoor and outdoor as the occasion requires. It is made of durable materials, this will ensure that it last long and you get value for your money. This rechargeable fan is very affordable, energy efficient and it operates quietly, even at high speed.