Features: On-neck design, free your hands. Suitable for traveling in hot weather. Three-speed wind speed, using the principle of fluid dynamics, reducing the natural wind. Adopt the technology of semiconductor refrigeration, reducing the temperature of your own space by up to 6~9 degrees. Built-in 2*1800mAh polymer-lithium-battery, 3-hours-of-charging can last 4-8 hours. Suitable for all kinds of scenarios, such as reading, sports, office, etc. Adjustable design, side steering 45 degrees. Ergonomic design, fit neck, comfortable to use.