Radiation Detector, Manufacturer Warranty Length 1 yr, Number of Batteries Required 2, Calibration Certificate Type NIST, Battery Chemistry Alkaline, Battery Run Time 800 hr, Beta Energy Sensitivity 300 keV, Maximum Dose Rate 500 uSv/hr, Minimum Dose Rate 1 Sv/hr, Digital Display Screen Type LCD with Backlight, Display Type Digital, Measuring Units CPM, CPS, nSv/hr, uR/hr, Batteries Included Yes, Battery Size AA