Feature 1[Color LED Indicators] This electromotive force detector has 5 color LED indicators to see the readings in the day or night, and can be carried around in your pocket or purse. 2[Health Protection] The electromotive force detector is designed for protecting your health by preventing potential bad effects from long term exposure to electromagnetic fields. 3[Accurate Measurement] The EMF tester runs on a single battery and reports EMF measurements over the range. 4[Process of Use] The electromotive force meter helps measure EMFs to identify devices that produce high radiation levels and enables users to determine the extent to which to limit exposure. 5[Wide Applications] The EMF meter can be used to test TVs, computers, microwave ovens, refrigerators, printers, cell phones, low frequency appliances, etc.Item Type: Electromagnetic Radiation TesterMaterial: ABSBattery: 9V 6F22 battery x 1 (shipped without battery)Frequency: Application 50 or 60Hz frequency monitoringGauss: Dark green 0 to 1.5 mGauss, Green 1.5 to 2.5 mGauss, Yellow 2.5 to 10 mGauss, Orange 10 to 20 mGauss, Red 20+ mGauss .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Electromagnetic Radiation Tester1 x Instruction Manual