I'm looking for an upgrade from my older GE that is very close to this one. What is the difference between the RCA RP7887 AM/FM Super Portable Radio and the RCA 7-2887 Superadio III Portable AM/FM Radio? From what I can see there is no diference but maybe someone can let me know. The unit I bought had the AM and FM numbers for turning were way off. Like the 680AM station was around the 800AM or the 910AM station was between 1000AM and 1200AM. That should have been corrected while it was being made.