Universal Power Bank concurrently charges up to 2 devices.

With respective capacities of 5,200 and 10,400 mAh, ECO-u500 and ECO-u1000 provide 2 USB ports for charging as many

[source: http://news.thomasnet.com/fullstory/Universal-Power-Bank-concurrently-charges-up-to-2-devices-20014433]