USB connection is for displaying charging info on a PC. The cable goes in the left front corner of the charger and the other end goes to a USB port on your PC. Charger comes with a mini CD - need to load and run that first.

I use another program by Hyperion to monitor charging, if I do that at all, its really just bling and 99% of the time I just run the charger. I've never hooked this one up or even tried. There must be some instructions on the CD, there is no mention of any of this except pointing to the location of the USB connection on the charger anywhere in my manual.

I've seen it discussed in other forums and it does work, at least with XP, not sure about the other OS in use.