This product died on me after less than 4 months of daily use. I would frequently store the charger in my car overnight (as I'm sure most people would). The fan on the inverter would start up incredibly slow after a cold night. That was my first sign that this thing might not be able to last for very much longer. Eventually, the fan just made this high pitch whirring sound, like it was stuck, when it would power on. The plastic piece covering the fan became very hot to the touch. I would usually just move it around until the fan eventually stopped making the sound and the heat would slowly dissipate. The charger eventually shorted out (it literally sparked) and is now completely dead.The product worked great for the last four months. My THEORY is that the product is not designed to stand up to colder temperatures. You may not have my issue, but I expect an item that is designed for a car to last through mild desert winters.