Standard ST-2G Microwave Leakage Detector with LCD Digital Display is a high quality consumer product with the most newly developer technology that utilizes an advanced sensor for detecting the microwave leaking from the microwave oven. The highly sensitive sensor can detect the microwave accurately, even at a low volume the injury of the radiationof microwave. Leakage volume in dangerous zone will sound, beeping and a red lamp flashing. Low leakage volume display for warning. Human factor engineering design is suitable for the operation of both hands. Battery operates for more than 1 year. Excellent reliability and high precision. SPECIFICATIONS: Calibrated at 2450MHZ, Range: 0- 9.99 mW/.cm2, Warning value:5.0 mW/cm2, Accuracy:+-1db, Power source: 9V battery, Battery life : 1 year minimum for routine chcking once a month.