This light weight, easy to carry battery actually has 3 power output ports: Main output port is a 16V port. This port can be used to power many different electronic devices that require 16V stable voltage. It also has a 5V USB port can be used to power or charge cell phones or any other device that can be charged from a USB port (USB power cable not included). Another port has a variable voltage from 10V ~ 12.6V. This port can be used to power many devices that require 12V power.