Many phones, laptops cameras and similar are only guaranteeing functionally by above 0 degree.... Luckily they often operate in lower temperatures too, but not

Many phones, laptops cameras and similar are only guaranteeing functionally by above 0 degree.... Luckily they often operate in lower temperatures too, but not seldomly by hoping they don't get cooled that much themself (because they are e.g. in your pocket).