The Unielek 3-Speed 12" Table Fan will help you feel cooler and comfortable throughout the year. With it 12-inch blades and oscillating fan head, this cooling fan can cover a large part of the room and provide maximum cooling. This portable fan is perfect for your home, office, kitchen counter, den, or any space where personal cooling is required. It is easy to assemble and having an energy-saving timer that turns the device off at the time you set saving you even more on energy costs. This model is DC fan without any battery inside. It should connect with external battery or solar panel for using. So it is very energy-efficient.