content: I bought this item originally from Wal-Mart. This is my FOURTH one in a little over a year. Every one I have had has died within 4 months. So I just kept either exchanging it for a new one, or buy a new one and return the broken one. Then it looked like Targus redesigned the PA248U because even though the model number was the same, they changed the casing completely and added an on/off button. I decided to give them the benefit of the doubt, so I got it. It was improved. Now it doesn't die outright. The fans will just stall out until you move the mat around and angle it up until the fans will restart. And to get warranty service, you have to pay to ship it back to them. But it costs over half as much to do that as it does to buy a brand new unit.