The Flextrac Power Feed makes a low voltage connection between the Flextrac and an LED power supply.
Just slide the Power Feed into the end of your Flextrac then put a female press-on barrel connector on the other end of the Power Feed wire plug it into the output of an LED power supply using a female . (female barrel connector and LED power supply sold separately)
LED strip lights are polarity sensitive. Be sure to connect the positive input on the Power feed to the positive side of the Flextrac.