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 Tester Material: ABS Battery: 9V 6F22 battery x 1 (shipped without battery) Frequency: Application 50 or 60Hz frequency monitoring Gauss: 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 1 x Electromagnetic Radiation Tester 1 x Instruction Manual