This was supposed to be my third purchase of this item but everything went wrong. Two of my previous purchases died after a while. The first had a blown capacitor and the second was stuck in fully open mode (it draws maximum power even when nothing is connected). I ordered this current item with "Prime" but received delivery today instead of two days delivery. Arrival took a month. The final blow is that they sent the wrong block. I bought the 175 model specifically because of the "No Fan" feature. We actually have the 225HD model with a large fan, which my wife calls the "ghost in the car" because the fan sounds like a groan as it keeps turning on and off. I should have learned my lesson earlier, but I really liked the no. fan design. While the units are working I have no complaints at all. They worked as intended until they broke and lasted a long time as I used them all day at work. I will not order again.