Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Check the Specs - Will not work for most cars

I was about to leave on a long road-trip. I liked the fact it had 2 plugs. But when it arrived and I opened it to check the manual, I discovered it requires a special connection to the car battery and was not recommended for most cars. I checked my car manual and discovered it could only handle 100 WATTS, so the purchase was totally useless. Please check your car manual before you purchase such an item. In fact, on the road trip, we burned out the car adapter by overloading it with 3 devices with standard car charger adapters. We also found that another AC adapter overheated, and would not supply sufficient power, unless the other devices were unplugged.