While metallized films such as the ATR series improve heat rejection, they can and will interfere with certain electronic devices. GPS, am/fm signal strength (such as "in the glass" antennas), tire pressure sensors and even cell phones are sometimes affected by the metal alloy content. The solution? ATX from LLumar. ATX is designed with a ceramic oxide in place of the traditional metal alloys. While the heat rejection is pretty much the same as the ATR series, ceramic films like ATX will not interfere with electronic signals, and in some cases, even improve their reception. This film has a lifetime warranty against all aspects of film failure and is available in charcoal.