Sounder help

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I have a SI-TEX Chromascope CVS-106 and I know nothing about it. I plan on putting it up for sale. I want to know if anyone can tell me a little about it? It belongs to a friend of mine and he just wants to get rid of it as he got it from someone who owed him some money and that person only had it on his boat for a week. I tried to talk to this person but it was a bad money deal and he wouldn't tell me anything. It's in the box it came in with all the parts and a book. The book don't match the unit. It dosen't even look like it has been hooked up. Any info would help. I have been on the SI-TEX web site but this model is not on it. All I know is the new ones sale for $300.00 and more.