As tragically1969 mentioned above, it is a Control Technology Corporation 2200 XM Controller. Here is a link to CTC legacy documentation: http://www.ctc-control.com/customer/techin...xdocsLegacy.asp {EDIT} Or it may be a CTC 2600 XM Controller. Here is a link to legacy 2600 documentation: http://www.ctc-control.com/customer/techin...csmisc.asp#2600