Fangrui Product Details Features: More Sensitive Than Other Electromagnetic Radiation Detector, Wide Measuring Range, Has A Long Service Life. Smaller Body, Larger Screen, Clearer Measurement Data And Easier Operation. Can Be Applied To Material Inspection, Environmental Test, Radiology Protection, Radiopharmaceutical Screening, Etc. With Mute, Alarm, Particle Sound Selection Button, Test, Mean Value Reset Retest Selection Button, Backlight Can Be Turned On Or Off. Specifications: Model: No Batteries Or Xr2 Pro With Battery(1200mah) Type: Electromagnetic Radiation Detection Screen Size: 57 X 43mm / 2.2 X 1.7in Battery: 3 * Aa 1.5v Battery Or 3 * 1.2v Rechargeable Battery (not Included) Test Range: S 0-99.999 W/cm (power Density) E 0-99.999 V/m (electric Field Strength) H 0-99.999 T (magnetic Field Strength) Test Accuracy: S 0.001w/cm (power Density) E 0.01 V/m (electric Field Strength) H 0.001 T (magnetic Field Strength) Frequency Range: S 50mhz-5ghz (power Density) E 20hz-100mhz (electric Field Strength) H 20hz-1mhz