Genius ECO-u521 5200mAh Power Bank with Safety Protection The ECO-u521 is a high capacity portable charger that includes various safety protection features to ensure product reliability and a stable, rapid charge. It’s compatible with just about every 5V Micro USB device – most smartphones, tablets, media players, game devices, e-readers and much more. The ECO-u521 comes packed with power with a total of 5200mAh, but is still lightweight at just 133g. Package Contents Power Bank Micro USB cable Multi-language user manual Electrical Characteristics : Capacity : 5200 Output : 5V/1.0 ~ 2.0A LED Indicator : YES