thermal protection , these are just plastic case screwed together with components inside . Cam gets superhot as it is , if you are in high heat area you will prob have issues . Its meant to stay in the car as it gets hot but I have found the parking mode if tough to engage since its motion / G sensor activated . I sat in my car for an hour and couldnt get it to activate pointed at my garage . Will constantly record and not shut off will also help heating up . I take it out of the vehicle .