A life saver in a box! This 2200 mAh personal charger for smartphones and tablets will save you when you are out with no access to wall plugs. Connect any USB cable to charge your smartphone or device, or use the included Micro USB cable. Micro USB cable is also used to recharge the power bank itself. A smart chip inside detects when it's being charged, and when to charge a phone. Lithium Ion Grade A Non-Recycled Battery. Outputs 5 Volts/0.8 Amp.