Feature: 1. MAIN FUNCTIONS: Nuclear radiation detector with built in geiger muller sensor, with quick response time, high accuracy, and can detect γ, X and β radiation, energy range is 48KeV‑3.0MeV ≤±15% (for 137Cs‑γ). 2. SOUND ALARM: The detected radiation exposure exceeds the alarm threshold (TREND: 0.5μSv/h), the radiation monitor will automatically sound an alarm, can be turned off by pressing the sound button on the screen. 3. LCD DATA DISPLAY: The detector has a white backlight large LCD screen, which displays real time dose (REAL), average radiation dose (AVG), radiation un chart, and the pause key for locking the test value. 4. BUILT IN BATTERY: Equipped with 2500mAh high capacity battery, the detector can enter a power saving mode after turning off the backlight, can work continuously for 1 week without the need for frequent charging. 5. EASY OPERATION: The Geiger counter has simple buttons and a clear screen, which is suitable for beginners, the elderly and advanced users, with convenient operation, stable performance and strong practicability. 6. WIDE APPLICATION: Widely used in automobiles, household use, nuclear power plants, accelerators, steel industry, healthcare, environmental testing, X β、γ non destructive testing and other fields. Specification: Item Type: Radiation Detector Product Model: AIR-02 Battery: 1 x 2500mAh Lithium Ion Battery (built in battery) Sensor Type: Energy Compensation Type Geiger Muller Tube (Geiger Counter Tube)Detection Ray Type: γ, X and β Rays Energy Range: 48keV-3.0MeV (137Cs-γ) Relative Inherent Error: < ±15% (at 1mSv/h) Measurement Range: Dose Rate: 0.00μSv/h-1mSv/h Measurement Range: Dose: 0.00μSv-99.99μSv Sensitivity: >1.5cps/μSv/h (vs.137Cs) Working Temperature: -10℃-50℃, ≤+10% Power Consumption: 0.25W Charging Time: 4-5 Hours Screen Size: Approx. 57 x 43mm / 2.2 x 1.7in. Package List: 1 x Detector1 x USB Cable1 x User Manual