Features： 1、Built in Memory: Portable geiger counter has built in memory, and some data such as accumulated dose value, dose rate alarm threshold and dose alarm threshold will not be lost after power failure. 2、Power Supply Mode: Giegermeter radiation detector has two power supply modes, which can be installed with 3 AAA batteries, or Type c power supply, button battery included: CR1220, and has dual alarm functions. 3、Multi Screen Display Function: Can adjust the alarm threshold arbitrarily, switch between Chinese and English, screen backlight, real time dose rate curve display function, etc. 4、Function Settings: Geiger counter radiation detector can be set for sound, backlight, language, time and date, calibration factor, clear dose. 5、Wide Application: Nuclear radiation detector can be used in home improvement radiation detection, irradiation processing enterprises, health and epidemic prevention, radiotherapy, nuclear laboratories and other scenarios. Specification： Item Type: Nuclear Radiation Detector Material: ABS Product Size:Approx. 116 x 60 x 25mm / 4.6 x 2.4 x 1.0in USB: 5V Language: Chinese and English Measuring Range: 0.1uSV/h-10mSV/h Dose Range: 0.00μSv - 10Sv Sensitivity: >1cps/μsv/h (under Condition Co60 Source) Energy Response: 48keV-1.5Mev Relative Error: <10% (at 1mSv/h) Power Supply: 3 x AAA Batteries (Delivered Without Batteries) Time recording battery (built-in battery) : Button battery CR1220, 40mAh Power Consumption: <150mW Temperature Characteristics: -10 DegreeC to +50 DegreeC Package List： 1 x Nuclear Radiation Detector 1 x English User Manual 1 x USB Cable 1 x Crossing Screwdriver