Based on the Catalog of Sharper Image (March 2008 issue), there are only three model available:

1. Sharper Image Ionic Breeze GP Silent Air Purifier with UV-C Germicidal Protection (Model S1871 Price $399.95).  One year Warranty.

2. Sharper Image Ionic Breeze QUADRA silent air Purifier (Model S1867  Price:$349.95)  One Year Warranty.

3. Sharper Image Hybrid GP Germicidal Air Purifier  (Model S1724 Price:$499.95)  One Year Warranty.

Before bidding, ask for the model # .  Model # not matching those above are the old model of Sharper Image.  Ask the seller for the warranty because those old model have five years unlimited warranty . Have a nice bidding