[R-390] Anyone Know about this FSK device & Value?

[RLucch2098 at aol.com]

Hi All;
When I bought my last Motorola R-390A, the seller included this device.
He said it was used with the R-390A's but would like to get any info I can, 
like value, etc!
It is an FSK converter CV-116C/URR, no cables & untested.
Made by ONEIDA Electronics, same as my R-390A speaker I got a few weeks ago.
Here are some pics, last one shows tag:
http://www.myradioroom.com/fskconverter1.jpg
http://www.myradioroom.com/fskconverter2.jpg
http://www.myradioroom.com/fskconverter3.jpg
Any info will be apprechiated.
73...Rich WA2RQY