I have actually hooked up 2 Casio MiniTVs to my Amiga just for fun.
I used the RF input on both of them, the first was a 2,3" TFT one with 60000 pixels resolution and the other one was a 4" LCD one. 2" was crystal clear and stable as rock but almost impossible to read had to turn text up to 30 pixel but very good for images.
The four inch one was almost useable in 640x256 with text in size12 or 14 or something but very narrow viewing angel of standard LCDs. both are dead now :-( dont trust those mainsadapeters the burn out sooner or later a fry your expensive toys.
The 3,5mm plug is probably an integrated compositevideo and audio in there was that kind of connetor one the casios and i jused it one the 4" with that rf to 3.5mm i bought .
Yes the Rfin was also a 3,5mm an mono.
What will you use it for amiga in a car or something?