Features: 1 [Ensure Health] This Electromagnetic Field Radiation Detector Helps Measure Emf Levels, Identifying Devices With High Radiation Output To Prevent Prolonged Exposure, Protecting Your Health. 2 [Expanded Frequency Range] The Emf Meter Measures Various Electromagnetic Fields From 50Hz To 20000Hz, Capable Of Detecting Cell Phones Within A 2Ft Range, Providing A Comprehensive Detecting Solution. 3 [Colorful Led Indicators] Featuring 5 Led Indicator Lights, The Magnetic Field Radiation Tester Offers Clear Readings Visible In Both Daylight And Darkness, Making It Convenient To Use In Different Environments. 4 [Versatile Applications] Ideal For Testing Tvs, Computers, Microwaves, Refrigerators, Printers, Cell Towers, Household Appliances, Ensuring Safety And Awareness Of Emf Exposure In Various Settings. 5 [Portable Design] Compact And Lightweight, This Electromagnetic Radiation Tester Can Easily Fit In Your Pocket Or Wallet, Allowing For Convenient Using And Ensuring Easy Access Whenever Needed. Specification Item Type: Magnetic Field Detector Material: Abs Battery: 9V 6F22 Battery X 1 (Not Included) Detection Range: 0~20+ Milligauss Detection Frequency: 50 60Hz (50-1000Hz Elf), (1000-20000Hz Vlf)