Features:  1. 3S Fast Heat: Dispel cold and keep you warm.  2.10000mAh power bank, can be used for 8 hour.  3. Intelligent Heating: Large area heating elements; far infrared heat; rapid heating.  4. No Fear of Washing: No fear of tearing or washing; as a new one for using a long time; easy to clean; direct washing. Pay attention: please take out the power bank (Not Included) before washing, put the USB interface back into the pocket and pull the zipper. Please ensure dry when use it again.  5. Applicable Sports: Suitable for camping, skateboarding, self-driving, rock climbing, cycling, travel, diving, daily warm wear and many more.     Specifications:  Item Name: Intelligent Heating Cotton Vest;  Color: Black;  Fabric: Polyester fiber (polyester);  Size: XL/2XL/3XL;  Power Supply Interface: USB;  Power Supply: 5V/2A Mobile Power (Not Included);  Age Of Application: Adults Men and Women;  Applicable Ambient Temperature: -40 to 14 Degree.     Note:  1. Please allow a slight error due to manual measurements.  2. Do not use the wet clothes. If the clothes are wet, please turn off the power and stop using.  3. This product does not include mobile power, you need to always connect to the mobile power when using.  4. Due to the different display and different light, the picture may not reflect the actual color of the item.     Package Included:  1 X Heating Vest (Power Bank Not Included).