I want to know the answer to the following question:
What device was RF only?
All the background I'm provided with is that "Since the new controllers don't have microphones on them like the second controller on the original console, certain games such as the Disk System version of The Legend of Zelda and Raid on Bungeling Bay will have certain tricks that cannot be replicated when played on an HVC-101 Famicom without a modded controller.". Is that enough to answer the question?
Answer: no