Generic HT-M2 Microwave Leakage Detector-LCD Display-High Sensitivity to Radiation-Builtin Alarm Function [9V Battery Included] Lcd digital readout - highly sensitive - accuracy: +/- 1Db Alarm beeps / led flashes in dangerous zones - excellent reliability and high precision - power supply: 9V battery Design suitable for use in either hand - calibration: 2450Mhz Battery Operates for More Than 1 Year - Measurement Range: 0-9.99mw/Cm2 Never Needs Recalibration - Warning: 5.0mw/Cm