I found this small device that says Walkman on back & Sony RM-MC28F on front. What is it? And how does it work?
LOLOLOLOLOLOL...it came from ancient times...it probably plays a "cassette" tape. The only way to explain it is that it's like an old fashioned iPod.
I believe the device you are talking about is the genuine Sony CD walkman Remote control RM-MC28F. It is a remote control which had security fan kits and remote wall mount clips. Learn more from http://www.ebay.ca/itm/GENUINE-Sony-CD-WALKMAN-Remote-control-RM-MC28F-/120892928688.