I does seem to be a battery powered ICS branded version of the fancier Elenco XK 200.
I found the manuals for the XK 150, XK 500 etc. on the Elenco website but unfortunately not the XK 200.
Looking at the specs of the XK 500 I see it has a XR 2206 in it for the function generator. That would have been nice to salvage from it
You might try asking Elenco, seems like their model number.