Propel 2200mAh Portable Keychain Power Bank - Black Built with a 2200mah Li-ion battery to offer ample battery capacity and power to your mobile devices Small, portable size make it ideal for traveling. Acts as a back-up battery for mobile devices when you need it the most 2200mAh Li-ion battery with a USB cable Comes with a keychain for easy carrying anytime you need backup power for your phone.