Features: Small size and compact, lightweight, the clip design easy to carry with. OLED-display design, the display clearer, and it can be displayed normally at night. Built-in rechargeable battery, Type-C interface, which can be tested for 50 hour after being fully charging. Dose rate alarm value and the metering alarm threshold can be set by pressing the button. With over-dose alarm function, sound and light alarm. Dose rate measured in real-time, and the cumulative dose and interval average are recorded at the same-time. The measurement error range small. Specifications: Material: Plastics Size: Approx. 108x15.3mm/4.25x0.60in Range: 0.05uSv-50mSv Accuracy: -17% to +25% Based-on 137Cs Y Working Environment: Temperature -20 to 50; Humidity