• This DP 7639 is a rechargeable mini desk fan. It has 13W of rated power with 3 speed adjustment system that give a high quality airflow. Its produce 4.2m/s effective wind speed. The fan features 90° up and down angle, and it is made with abs material. Moreover, the fan offers a 2400mAh battery that can give you a perfect performance in both indoor and outdoor use. The battery can lasts 3-6 hours in only 4 hours charging.