Features: 1.3 Level Adjustable: The fan adopts 3 level adjustable to meet your different needs, low noise, can work continuously, and has less impact on your daily work. 2.Large Battery Capacity: 20,000 mah power supply, high grade can run for 12 hours, low grade about 24 hours, can be used for a long time, strong endurance. 3.How it 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. 4.Versatile: The long sleeved vest is designed to keep you cool and protect you from the sun. You can also wear it when you travel in summer. 5.Application Scenario: Fan adopts rotary thread combination, easy installation, multi scenes universal, high temperature environment, outdoor environment, indoor environment, outdoor adventure, travel. 6.Nylon Material: Air conditioning clothing made of nylon material, thin fabric, cool and breathable, not easy to damage, can be used for a long time. Specification Item Type: Adjustable Cooling Vest Material: Nylon, 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 2A Power Bank Output: DC 5V 2.1A Package List: 1 x Clothes 2 x Fan 1 x Speed Control Line 1 x Power Bank1 x Charging Cable1 x Instruction Manual