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 Cable 1 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