USB charging: Powered by built-in rechargeable battery, can last 3 to 7 hours on a single charge. Comes with USB cable for easy charging using power bank, laptop or other power with USB port. Small and compact portable fan: handle size and lightweight, convenient to take out or put in your bag. Large space saving for indoor and outdoor activities. Comfortable and Safe: Use high quality environmental materials, with quiet operation, you can hold this by the bed and sleep comfortably without noise disturbing you. Fast cool down: Equipped with fan blades and strong force ensure maximum airflow. The design is ideal for outdoor crowds, and you don 't have to worry about the outdoors even when the temperature is so high, because this fan can cool you, is a must-have for summer. Compact Design: convenient to hold in the hand-held fan that can easily slide into your backpack or bag, take the fan with you anytime and anywhere.