Note: Batteries Not IncludedThe nuclear radiation detector can use rechargeable batteries or dry batteries. You can buy them by searching "AA rechargeable batteries" or "AA batteries" on Amazon. One machine needs two batteries. Fast Response, Wide Measurement RangeThe nuclear radiation monitor responds quickly to radiation, and will alarm in time in high-risk environments, please check our video reference. Note: In a low-radiation environment, the reaction speed will be slightly reduced, but the result is accurate, please confirm that it is acceptable before purchasing. Easy to Use, Real-time DisplayThe nuclear radiation detector is portable and easy to use for beginners, seniors or seniors and advanced users. Just long press the start button to display the real-time radiation rate and the average radiation rate within 5 minutes (5, 30, 60 minutes adjustable). [Intelligent protection & alarm] Enter the alarm setting option to set the dose rate alarm value (can be set to 0.5/1.0/1.5/2.0/2.5/5.0/10.0/50.0/100.0Sv/h). When the radiation value exceeds the set value, the nuclear radiation dosimeter will automatically alarm. The normal range of nuclear radiation in daily life is <0.5Sv/h, so we recommend that you set the alarm rate to 0.5Sv/h. Wide applicationWidely used in nuclear power plants, accelerators, iron and steel industry, chemical industry, isotope application, industrial X, gamma non-destructive testing, cobalt source treatment, gamma ray and other fields of radioactive indication.Nuclear facility radiation, radioactive laboratory and surrounding environment monitoring.