... field. It is waterproof and dustproof (IP67) featuring long battery life, sunlight readable display, and operation in extreme temperature ... on the device Other enunciators on system tray EnvironmentalOperating temperature: -22 to 130 degrees F (-30 to 55 ... humidity, sand and dust, vibration, altitude, shockhigh temperature, low temperature, temperature shock Model available that is FM Approved Non- ...