High Sensitivity Nuclear Radiation Detector - 'AA rechargeable batteries' or 'AA batteries' Needed. NO battery included. You can search on Amazon to buy them. The Geiger Counter can use either rechargeable batteries or dry batteries. One nuclear radiation monitor requires two batteries. Professional Geiger Counter, The Geiger core radiation detector has audible and visual signals built-in for the level of radiation captured. With Large LCD Screen - The large LCD screen of the nuclear detector allows you to read the real-time values easily and quickly. Even in a dark environment, you can still clearly see the numbers on the screen. Pressing the Power on button can make the screen in night mode. The largest measured value is 1000Sv/h. Portable and Easy to Use - Our handheld nuclear radiation detector is compact and portable. The detector is available in Sv/h. Our instructions are detailed and the dosimeter is easy to operate for beginners, seniors, and advanced users. The data is also saved after a power failure. Daily use of the nuclear radiation detector helps to avoid radiation hazards in everyday life. Fast Response and Smart Protection Alarm- The nuclear radiation monitor responds quickly to radiation, and will alarm in time in high-risk environments. The instrument enjoys high flexibility and can measure the environmental background. The detection value is updated in real-time. Enter the option of alarm setting to set the alarm value of dosage rate. When the radiation value exceeds the set value, the nuclear radiation dosimeter will alarm automatically. Wide Application - Nuclear radiation monitors are widely used for personal safety protection monitoring and a radiological indication of workers in the following fields: nuclear power plants, gas pedals, steel industry, chemical industry, isotope applications, industrial X and nondestructive defect detection, radiological medicine, cobalt source handling, radiation, radioactive laboratories and environmental monitoring around nuclear facilities.