Each one needs a power supply to work. They both use the same type of supply. Video out is from the Genesis. Audio can be too, or you can use the stereo out on the Sega CD. If you use the Sega Cd audio out,with the Genesis 1 I do believe you need a audio mixing cable that plugs into the earphone jack and into the back of the Sega Cd. After everything is combined it'll form Menasor.
Enjoy.