The high-end Anker power bank features a large display as well as a massive combined output of up to 200 watts, which means that the Prime is primarily designed for charging two power-hungry devices via USB-C at the same time.https://www.notebookcheck.net/Anker-Prime-power-bank-with-20-000-mAh-back-on-sale-for-lowest-Amazon-price-ever.822956.0.html
As with most products these go on sale regularly, never ever buy these at full price. On good days you can get two very similarly performing competitor models for the price of the one mentioned in this article/ad.