Fangrui Product Details 1. Pen Type Nuclear Radiation Detector Geiger Counter Sound Light Alarm 2. Adopt Gm Counter Tube, Mainly Used For Monitoring X, Y And Β Rays, High Sensitivity And Accurate Measurement. 3. Oled Display Screen: Clear Display Of Instantaneous Dose, Average Dose And Accumulated Dose Rate, Visible At Night. 4. Easy To Use: One Key Start, Automatic Test, If The Test Result Exceeds The Standard, There Is An Acoustic And Optical Alarm. 5. Built-in Lithium Battery Power Supply, Power Saving And Durable. 6. 0.7 Ounces Of Weight And Small Size Like Lipstick, Very Convenient To Carry. 7. Parameters: 8. Material: Abs Material 9. Sensor: 48mm Geiger Counter Tube 10. Measurement Range: 0.05usv-50msv 11. Measurement Accuracy: - ~+ Based On 137csy 12. Charging Time: 2-3 Hours 13. Alarm Response Time: Less Than 10s 14. Battery: 3.7v, 300mah Lithium Battery 15. Working Environment: Temperature -20 ~ 50 Degrees Celsius, Humidity Less Than Rh No Condensation 16. Product Size: 108 X 18 X 15.3mm 17. Item Weight: 19g 18. Packing List: 19. 1 X Geiger Counter 20. 1 X Type-c Cable 21. 1 X Manual (english)