BUY A ZALMAN!!!I purchased this chill mat, and it worked for a short period of time. The connector would not stay in, because it was a prong-type connector and not a USB connector. The company sent me a new cord, but it would not stay in, either. I tried every which way to support the connector, so it would stay in, but finally gave up!Bought the Zalman, and it has a variable fan, which is almost silent and haven't had a moment's problem with it.You won't regret going with the Zalman.