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The aim of this study or paper is to design and implement a system or device (an electronic circuit) for testing, discovering (detect) and measuring the electromagnetic field intensity (EMF) in the local area (in our environments), cased by the microwaves product from cellars mobiles or other devices.A design was built and tested theoretically and implemented practically then tested and the results were discussed and putted in tables and curves. The tests show how the dangers of EMFs are near to us and it is real and can effect on the human health according to the incurably increasing by the numbers of cellars mobiles and communications applications. The study shown that if we use the mobile cellar phone for 10 hours continuously, we be very close to the danger limits of the EMFs on human. Finally, the test shows the different between the cellars mobiles and the calling methods in the averages received power.