Just want to ask if it is okay to use an extension cable on a mini? I have one used as a rear cam and the supplied cable is short. My car only has one cig port and the cable is not long enough to reach the front. Also, does the mini have thermal protection? Does it shutdown when it is hot? I don't see any note regarding thermal protection in the manual but there is table of voice prompts. It has one in the manual saying something like "shutting down due to high temperature".