In accordance with an embodiment, an apparatus for analyzing signals comprises a spectrum analyzer and a frequency extension module. The ride-on vehicle includes a frame adapted to support a child, and a drive assembly with a battery-powered motor assembly. A conductive assembly may be positioned in each radial channel such that a contact portion of the conductive assembly is positioned adjacent a shaft passing through the center of the current diverter ring. The detection roller includes one support roller selected from the support rollers, and is provided with the roller shaft.