Used. RF Converter for the Nintendo Famicom. It may work for the US NES but I am not 100% sure.

Unable to test it. 

So selling cheap and  “as is” or "for parts".

Please check the photos.

I am an American currently living in Tokyo.   Packages will be sent (Airmail) via (JAPAN POST / USPS) and given a tracking number. The package(s) should arrive within 7-12 days to the US.  Not responsible for any custom duties.  Please check your local regulations.  US customers shouldn't have to worry because the price won't breach the personal exemption threshold.

Feel free to send any questions.