I want to know the answer to the following question:
What device was RF only?
All the background I'm provided with is that "Because HVC-101 used composite video output instead of being RF only like the HVC-001, Nintendo marketed the newer model as the AV Famicom (AV仕様ファミコン, Eibui Shiyō Famikon?).". Is that enough to answer the question?
Answer: yes