The Spare 10000 mAh Power Bank features a 10,000 mAh/37Wh Grade A lithium ion battery, LED indicator lights and a flashlight. You can charge up to three devices with a maximum output of 5V/2.1A, providing convenience and efficiency. This power bank comes with a USB-to-Micro-USB connecting cable that can recharge the battery backup or charge other devices with a Micro-USB input, including Android smartphones from Samsung and other brands. Power banks are permitted in carry-on luggage only, and at the discretion of TSA agents. Please charge the power bank before initial use.