Nuclear Radiation Detector Beta Gamma X Ray Radiation Dosimeter Sound Vibration Alarm Geiger Counter Item Type: Radiation Detector Material: ABS Model: GM300C Power Supply: 1 x 18650 lithium ion battery 2200mAh (built in) Radiation Types: α β γ X ray Measurement Range: 0.01-1000μSv/h Energy Response: 40KeV-1.5MeV Measurement Accuracy: Better than ±20% Measurement Units: μSv/h, mSv/h, mR/h, CPS, μSv,mSv Alarm Function: Can set an alarm threshold Alarm Method: Sound, vibration (with independent switch) Accumulated Time: 1-9999 minutes can be set Accumulated Dose: Automatic accumulation, resettable manually Maximum Hold: Automatically hold the maximum value Curve Observing: The latest one hour curve chart, and it automatically calculates the maximum and average values Measurement Modes: Fast and smooth modes Languages: Chinese and English menu Operating Temperature: -20℃ to +60℃ Operating Humidity: 5%-95%RH (non condensing) Charging Time: <6H