Built-in lithium-ion battery 3.7 850mah Features: Nuclear radiation detectorFNIRSI GC-02 has built-in GM sensor, rapid gamma & X-ray measurement, curve recording, timed monitoring, and can record 10 sets of data. Dose 0.00 Sv-500 mSv, energy range: 48 keV - 15 Mev plus/minus 30%. Smart Alarm2 modes of light/sound, the alarm threshold can be set as needed. Regardless of the dormant mode or active status of the geiger counter, once the radiation exceeds the preset safety limit, it will automatically trigger the alarm. User friendly use1.5 -inch IPS display. The screen brightness is adjustable, sleep settings and automatic shutdown. 8 languages can be switched. Radiation detector built-in 850 mAh lithium battery, Type-C interface charge. Working principleRadiation meter uses a trachea or small room as a probe to detect ionizing radiation gamma/X-ray. Radiation ionization generates ion pairs, ions are enlarged and converted into electrical pulse counts to quickly measure Application fieldNuclear Radiation Detector is widely used in the ionizing radiation environment, covering medical radiation dose monitoring, radiological room, home installation, geological exploration, iron ore detection, nuclear power plant, etc. Specifications: Material: ABS Metal Size: 106.5*44.5*25mm Detection Radiation type: lonizing radiation(gamma/X-ray, etc) Detector: Energy Compensation GM tube (Geiger Technology tube ) Dose equivalent rate: 0.00-1000Sv/h (1mSv/h) Cumulative dose equivalent: 0.00Sv-500.0mSv Energy range: 48keV-1.5Mev30% (for 137Cs-) Language: Chinese, English, Russian, German, Japanese, Portuguese, Spanish, Korean Sensitivity: 80CPM/uSv (For Co-60) Dosage unit: Sv/h,Gy/h,mR/h,cps,cpm Switch Alarm method: light, sound Power supply: 850mAh lithium battery Package Contents FNIRSI GC-02 nuclear radiation detector *1 Hanging rope *1 Charging cable *1 Instructions *1 Packaging box *1