1、Fine workmanship and nice performance. 2、Accurate and reliable; has high durability. 3、Operate on a single b-attery, and reports EMF measurements in five milli Gauss ranges. 4、Measure wide spectrum of EMFs from 50Hz up to 20,000 Hz, and it can register a cell phone that is within 2 feet. 5、Measure EMF level protect from potentially harmful long term overexposure to EMFs. 6、Help measure the electromagnetic fields to identify appliances that produce high-level emissions. 7、Help to keep you away from radiation, beneficial to your health. 8、Easy to read multi-segment Led display; easy to use. Features: Fine workmanship and nice performance. Accurate and reliable; has high durability. Operates on a single b-attery, and reports EMF measurements in five milli Gauss ranges. Measure wide spectrum of EMFs from 50Hz up to 20,000 Hz, and it can register a cell phone that is within 2 feet. Measure EMF level protect from potentially harmful long term overexposure to EMFs. Help measure the electromagnetic fields to identify appliances that produce high-level emissions. Help to keep you away from radiation, beneficial to your health. Easy to read multi-segment Led display; easy to use. Specifications: Material: ABS Color: black Accuracy: +/- 5% Detection range: 0 to 20+ milli gauss Detection frequency: 30~20,000Hz Power supply 1 * 9V b-attery (included) Item size: 140 * 52 * 25mm / 5.51 * 2.05 * 0.98in Package size: 140 * 53 * 29mm / 5.51 * 2.09 * 1.14in Package weight: 101g / 3.56ounces The Five Scales: The 1st Light detects a Normal EMF field, what is always around you. The range is between 0 to 1.5 mG The 2nd Light (GREEN) detects a Low Level EMF, which range is between 1.5 to 2.5 mG. The 3rd Light (YELLOW) detects a Mid Level EMF in the range between 2.5 to 10 mG. The 4th Light (ORANGE) detects a High Level EMF field in the range between 10 to 20 mG. The 5th Light (RED) detects an Extremely High EMF Range of 20+ mG. Note: 1.Due to the different display screen and light effect, the actual color of the item might be slightly different from the color showed on the pictures. 2.Please allow a little measuring deviation due to manual measurement. Package List: 1 * Detector 1 * 9V Battery 1 * English User Manual 1 * Detector 1 * 9V Battery 1 * English User Manual