you need this rf unit  for the genesis  if you have a hd tv or a monitor..the thing i love about rf units vs the 3 plug cables is that  you can string the rf units and connect one system to each other..one after the other...everytime i get a new system(new or classic) i always purchase a rf unit with it..because they are so versitle  i have  12 systems back to back with this method..and the picture quality is excellent on all systems...this is a must have for all game systems