The Anker Powerbank 20K 87W is a high-capacity power bank designed for heavy users. With a massive 20,000mAh capacity and support for 87W fast charging, it can charge laptops, smartphones, and other USB-C devices at lightning speed. The compact design makes it portable despite its large capacity. Capacity: 20000mAh, Power Output: 87W, Input: USB-C 5V/2A. Compatibility: Laptops, smartphones, tablets.