Giving a offer on a property prior to viewing

[Russell Brooks]

Here is my situation, I am looking at investment properties that are posted on Zillow.  In most cases there are lots of good pictures and description of work that has been done on the property.  With that said so I don't waste the agents time, is it out of the question to contact the selling agent give them the ballpark range I am willing to offer before I even conduct a visit?  If they are agreeable I would then go see the property and if it is as described make a formal offer.