besides things like LCD screens that have a liquid matrix that can freeze and damage if too cold
well,i obviously do not know how cold it would take to freeze an lcd screen. but i do know that millions of them are shipped around the world, in unheated trucks. even in remote area's like Alaska. freezing is one thing, damage is another. but since i hate the cold, i would not be out in it very long until it is above freezing. actually i am a bit sensitive to both cold and heat. if i am going to be out doors working, it will be between 40 and 90. any hotter than 90 i call it quits, unless it is an absolute necessity. and the same with cold. less than 40, with a few exceptions, requires a necessity. hunting is the only thing i voluntarily stay out in the cold below +40 degrees (f). I DO WANT TO THANK BOTH OF YOU, that is the information i really needed to know.