Features 1. Wide Range Of Applications: The EMF meter helps to measure electromagnetic fields, identify equipment that generates high radiation, and enable users to make decisions to limit exposure. Mainly used for testing televisions, computers, printers, microwaves, refrigerators, cellular towers, low-frequency appliances, etc. 2. 5 LED Indicator Lights: Easy to read multi-segment LED display screen. The detector has 5 LED indicator lights that can be read during the day or in the dark, making it easy to carry around as it can be placed in a pocket or wallet. 3. No Charging Required: The detector operates on a single battery and provides EMF measurement results within a range of 5 milligauss. When the battery is depleted, replace it with a new one. Use a screwdriver to open the cover, remove the old battery, insert a new battery, and securely close the cover. 4. Accurate Measurement: Measures various EMFs from 50 Hz to 20000 Hz, and detects devices within 2 feet. 5. Protect Your Health: Measure electromagnetic field levels to help prevent long-term overexposure to electromagnetic fields that may be harmful. This electromagnetic field detector can be used at home, in the office, and other environments. Specification 5-LED indicators, representing different radiation values 1 x 9V battery (included) Application: 50/60Hz frequency monitoring Dark green: 0 to 1.5 milligauss; Green: 1.5 to 2.5 milligauss; Yellow: 2.5 to 10 milligauss; Orange: 10 to 20 milligauss; Red: 20+ milligauss; Material: ABS Color: Black, White Size: 14.3 x 2.9 x 5.3 cm Weight: 100 g Package Includes: 1x Host 1x Battery 1x English User Manual