For the Flame series and Inferno, a coiled cable with a D-Tap / P-Tap type connector on one end and DC barrel on the other end is included. This is designed to allow you to power your device from an external battery system. To use this simply connect the D-Tap connector to your power source. Ensure that the output of the power source does not exceed 16.8V DC and ideally should be using either 12 or 14v. When the D-Tap cable is in use it will replace the DC input and override any attached batteries unless battery priority mode is activated.