cold The HX-20 is designed for use in conditions where the temperature is below 95° F (35° C), and above 41°F (5° C). The HX-20 will not work reliably outside of this temperature range. Protect the HX-20 from extreme heat and Protect the HX-20 from extreme heat and cold Storing the HX-20 in conditions that are too hot or too cold may damage it permanently. 11