Features MAIN PURPOSE --- Handheld nuclear radiation detector, can be used to test beta, gamma, x rays, compact and easy to carry, alarm threshold can be set arbitrarily. CLEAR DISPLAY --- This radiation tester adopts a 1.8in color TFT screen display, with waveform display trend, easy to read data clearly at any time. HIGH PERFORMANCE --- With high sensitivity and good stability, with instant response (3‑5S), small operating error, which is efficient and durable. MULTIPLE ALARMS --- When the radiation exceeds the standard, it has sound, light, display color triple alarm, and has 4 levels brightness adjustment. POWER SUPPLY --- Equipped with USB cable, can be charged via USB, and built in lithium battery, the detector can be operated for a long time. Specification: Item Type: Radiation Detector Power Supply: 3.7V 1000mAh polymer lithium battery (built in battery) Charging Voltage: 5V Charging Current: ≥1A Indicator Light: Green light on, charging; green light off, fully charged. Display: 1.8in color TFT display, 4 levels brightness adjustment Shell Material: ABS Technical Parameter: Detectable Species: β, γ, x rays Test Tube Model: J302 Tube Real Time Dose Range: 0.00-9.99mSv/h Cumulative Dose Range: 0.00-500mSv Sensitivity: 0.25cps/uSv/h Energy Response: 48keV-1.5MeV Resolution: 0.01uSv/h Error: ≤10% Package List:1 x Radiation Detector 1 x USB Cable1 x User Manual Note:Do not bump it at will to avoid irreversible damage. Package List 1 x Radiation Detector 1 x USB Cable 1 x User Manual