Dual-port power bank 20,000 mAh battery The power bank can be charged in two ways: either using a charger like any other device (USB cable included), or via solar energy (provided the power bank is properly exposed to sunlight). 20,000 mAh power bank that can be charged by sunlight (solar) or directly by plugging into a charger like any other device. Micro USB for charging the power bank (cable included). (WhatsApp only)