I had six of one brand that failed below 30'F. I expected to fly down to 0'F and found this very upsetting. My radios of the past did not do this. Worse still you would not be aware of this because coming from the house or car they would retain some heat and then slowly die as their temperature dropped Any Rx that will run at these low temperatures.?? Almost all the old "am"s would Rick RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]