Portable Size: This nuclear radiation detector has the pen type design for you to carry it easily, you can even put it into your pocket to carry Easy to Operate: One button open and measuring, you can get the results quickly and easily. Our radiation detector uses a 48mm Geiger counter tube, detection range is 0.05uSv-50mSv OLED Display: Easy observation in different light environments, easy to read data, real-time display of instantaneous dose rate, cumulative dose, average dose rate Over-limit Sound and Light Alarm Reminder: Radiation monitor measures high sensitivity. When the dose rate radiation dose exceeds the threshold,an audible and flashing alarm will automatically sound 50 Hours Measure Continuously: USB charging, built-in lithium battery, can measure continuously for 50h after fully charged, only 2-3h to charge, radiation detection for antiques, building materials, furniture, food, etc Specifications Sensor: 48mm Geiger counter tube Measuring range: 0.05uSv~50mSv Measurement accuracy: -17%~+25% based on 137Cs y Working environment: temperature -20C~50C; humidity