What is the biggest selling point of external power supply for customers?

The external power supply of the battery is stylish, portable and compact, and the convenience of outdoor use is fully considered. The batteries are all car-grade batteries, and the products are safe and guaranteed; The main function is to integrate fast charging USB, TYPE-C and so on. Meet some fast charging needs of digital products; The output of AC part is also pure sine wave, which is consistent and stable with the commercial power.