Wayfinder V2020 Wireless Digital Compass & Thermometer Wayfinder V2020 Wireless Full Spectrum Compass Thermometer General Features: Silver plastic casing RF (radio frequency) wireless Full spectrum range Measures -35F to 120F in Fahrenheit or Celsius Magnetic sensor technology Simple compass setup 3-mode compass displa All-weather performance Ice-Alert: Warns of hazardous road conditions! Magnetic distortion flag alerts you when there's interference