The MICRO ALERT 2 RF Radiation Detector can sit in your pocket and depending on the sensitivity you selected, warn you about RF Radiation Exposure from wireless sources like WiFi, Cell Phone Towers, Radar, Microwave Ovens and more. Designed with a very low power consumption, it can stay be left on continuously for years. It has a user single replaceable battery. The sources of radio emissions can be unexpected and surprising. By placing the MicroAlert 2™ RF Radiation Detector in your pocket, these sources are revealed.