I've purchased two of these. While they have a geek factor when you first get them, you soon learn they are not suitable for a warm car nor a cold one - the displays freeze up requiring them to be unplugged and replugged. Gets annoying after a few days. Also, the company does not respond to email about this or any other problems so if you wish to throw $160 out the window, by all means do so, but recognize you will get a quirky gadget that is almost never accurate (requires constant adjustment), whose display and internals are not well suited for the automobile environment and where there is no customer support if something goes wrong.