Note: The color of the product we ship is the color in the first picture, and the specification and quantity are shipped according to the quantity and specification described in the title. If you need to change the color or style, you need to contact us within 12 hours after placing the order. Our product description: Product 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: Product 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 Note: Because the model and display effect of the monitor may be different, there may be slight differences in color, and the size is manually measured, there may be an error of 1-2cm, please understand.