With built-in GM sensor, it provides fast response time and high accuracy, able to detect Gamma, Beta and X-rays Light/Vibration/Sound 3 combined alarm modes to choose Widely applied in the environment where existing ionize radiation Great for home improvement radiation ...With built-in GM sensor, it provides fast response time and high accuracy, able to detect Gamma, Beta and X-rays Light/Vibration/Sound 3 combined alarm modes to choose Widely applied in the environment where existing ionize radiation Great for home improvement radiation, geological survey, iron, Inspection vehicles, nuclear power plants, industry, radiology, radiology laboratories and so on