I tore mine out cause it was a piece of shit. Go to Jaycar/Autobarn/Supercheap or whatever you have where you are and you can buy an in-car one that hooks into a 12v source, neg and the pos side of your rear demister. I had one of these, but never hooked it up to the demister cause my demister was never hooked up, but it didn't seem to work too badly. I think it cost me $20.00.