When making your item description make it as complete as possible.
Many people find your auction through the search engine, so use as complete and descriptive headline with good keywords too- this will make your listing easy to find for the person looking for your item.
Leave no stone unturned- don't neglect to mention some crucial piece of info.
Bidders will steer clear if they sense something important missing. Plus someone might buy and won't have his or her expectations met...
That could be a problem. Include all necessary info.