[Heater vest only/20,000mAh large capacity battery] It can last up to about 7.5 hours. The specifications of this product are "Battery Output (Type-C): 5V⎓3.1A / 5V⎓2.4A / 9V⎓2.22A / 12V⎓1.67A" and "Battery Capacity: 20,000mAh". *This product does not come with an AC adapter. [PSE certified] 
Excitech power banks are PSE certified. PSE is a marking mark that indicates compliance with the standards of the Electrical Appliance Safety Act. [How to view the remaining battery level/about charging] When you press the power button, the LCD screen displays the battery level. The next digit of the number displayed on the "Charging" LCD screen will flash. (Charging time) about 6~8 hours. The "Charging Complete" LCD screen will light up to 100%. *When charging, use the included cord (Type-C) and use an AC adapter with a rated power supply of 5V⎓2.5A or less (5V⎓2A or less if using MicroUSB) or a USB port on your computer. [About warranty] The warranty is for 6 months from the date of purchase. If the malfunction occurs within 6 months from the date of purchase, please present this document and request repair. *When charging the battery, if you use a rated power supply: 5V⎓2.5A or higher (5V⎓2A or less when using MicroUSB) and it breaks down, it will not be covered by the warranty even during the warranty period. [Package Contents] 3.7V/20,000mAh/74Wh battery, USB cable (Type-C), instruction manual (with warranty card) Battery input and output: The specifications of this product are "Battery input (MICRO):D C5V⎓2A / 9V⎓2A / 12V⎓1.5A, battery input (Type-C):D C5V⎓2.5A / 9V⎓2A / 12V⎓1.5A, battery output (USB1/USB2): 5V⎓4.5A / 5V⎓3A / 9V⎓2A / 12V⎓1.5A, battery output (Type-C) : 5V⎓3.1A / 5V⎓2.4A / 9V⎓2.22A / 12V⎓1.67A" and "Battery capacity: 20,000mAh". 【How to use】 When the battery body is connected to the device, it will automatically start powering. If the power supply does not start, press the power button. The ports for power supply are "USB1", "USB2", and "Type-C".