This Aluminum 4,000 mAh Power Bank provides reliable, on-the-go power with its rechargeable lithium polymer Grade A battery (14.8Wh). Capable of charging smartphones, MP3 players, and tablets, this power bank offers a total output of 5V/2A. With dual output ports, you can charge two devices at once, and the included battery check button allows you to easily monitor remaining power. This versatile power bank charges via USB-A to Micro cable (included) and is compatible with devices that use a micro-USB input, such as Android™ smartphones from brands like Samsung®, Motorola®, HTC®, and Nokia®. Input: 5V/1000mA; Output 1: 5V/2000mA; Output 2: 5V/1000mA. Please note that power banks are allowed in carry-on luggage only, subject to TSA regulations.