My 2013 Santa Fe Limited has a 115 volt 150 Watt power outlet in back. I asked Hyundai about the kind of wave form (pure sine wave, modified sine wave or square wave or what) but they have not gotten back to me about it. I tried charging a Norelco cordless shaver by plugging it in. It apparrently fried the electronics and I had to get a new shaver. I would like to use the outlet to charge a laptop or a cordess drill but I do not want to fry them too. What have folks used the outlet for?