14mm super high strength shaft and fibreglass ribs provides the fan umbrella top quality and reliable, it is lightweight to carry and can withstand strong winds. Unlike an ordinary umbrella, triangle structure design, the connection between the stretcher and the runner are more stable. So it is excellent in wind resistance. Also it is resistant to rust and corrosion. Ergonomic straight handle of the umbrella is anti-slip and easy to grasp, you will not get tired even when used for a long time. Also, the handle with power control button and accumulator battery insided, and provide 1 USB port. https://www.diyumbrellas.com/gol...brella/fan-umbrella.html