How to use GPS Mio C20 by plugging USB cable into electrical

Hello, I have a GPS Mio C520. I installed iGO on the GPS. I would like to test at home but when I plug the GPS with a USB cable to the electrical outlet. The GPS displays the USB -> PC connection page. I would like to know if there is a setting to do to use the GPS from home without having to plug into a cigarette lighter.