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Dark green 0 1.5 milligauss; green light 1.5 to 2.5 milligauss; blue 2.5 to 10 milligauss; orange 10 to 20 milligauss; red 20 + milligauss. Application 50/60Hz frequency monitoring. Keeps you away from radiation, good for . Special function 5-LED indicators, representing different radiation values; easy to use. Power supply method:dry battery 9V 6F22 (without battery), Manufacturer: Littimoon