The Astoria 20000mAh 18W Power Bank effectively and efficiently charges devices with dual USB-A output ports and two input ports (USB-C & Micro-USB). Each port can reach a maximum output of 18W, and the combined output of both ports can reach up to 5V/3.0A, allowing for simultaneous phone and tablet charging. Advanced circuit chips provide protection against overcharging, over-discharging, overheating and short circuits.