Features: 1.Polyester Fiber Material: Air conditioned cloth is made of polyester fiber material, thin and breathable, not only for cooling, but also for sun protection, not easy to damage, and can be used for a long time. 2.3 Gear Adjustable: The fan within the vest has three levels of adjustable wind speed to meet your different needs, low noise, can work continuously. 3.Long Endurance: The fan adopts 20000mAh power supply, which can last for 12 hours in high grade and about 24 hours in low grade. It can be used for a long time and has strong endurance. 4.How Vest Works: Through a high speed fan at waist height, a large amount of air outside the body flows parallel to the body surface, thereby rapidly evaporating sweat and reducing the temperature of the body surface. 5.Application Scenario: Fan adopts rotating thread combination, easy installation, can be used for high temperature environment, outdoor and indoor, outdoor adventure, travel, etc. Specification Item Type: Cooling Fan Vest Material: Polyester fiber, plastic, metal, electronic components Power Bank Battery Type: Lithium battery (shipped with supporting battery) Power Bank Battery Capacity: 20000mah 3.7V Power Bank Input: DC 5V=2.1A Power Bank Output: DC 5V=2.1A Package List: 1 x Cooling Vest2 x Fan 1 x Speed Regulating Line 1 x Power Bank 1 x Charging Cable 1 x Specification