With the EAS 98610 Ambient Temperature Sensor, you'll never have to guess what the outside air temperature is ever again! This sensor is a 0.2 Diameter, Waterproof Sensor that is rated for -40°F to 230°F and ready to work. All you have to do is plug it into Edge's Universal Input system! If your vehicle is not equipped with an outside air temperature sensor, then this is a must-have.