This high capacity charger has 2 high-speed charging ports which provide up to 2.1A adaptive power output. Powered by TP-Link Smart Charging technology, these output ports can intelligently recognize different products & are designed to be capable of delivering appropriate power for devices with large & tiny battery respectively. Li-Polymer battery is thin & lightweight while it also improves safety, leading to its wide applications in premium digital devices. Compared to those using Li-ion battery, this power bank looks much sleeker & thinner. It is a portable charger that perfectly fits in your hand while working with your phone. Housed in a portable design, TL-PB20000 is a high capacity 20000m Ah power bank compatible with most of your digital devices. With full capacity, it can hold enough juice to fully charge your device multiple times. Supporting 5V/2.1A recharging speed, TL-PB20000 can quickly recover from empty to full capacity, saving much time as models supporting 5V/1A do.