My father has a pacemaker installed and he is worried that the magnetic field of the transformers in residential areas will affect the function of the pacemaker. He wants to know how far away is safe, and whether there is any influence from the mobile communication towers. In principle, a distance of more than 30m should be kept from large transformers, but the distance can be relaxed for general neighborhoods. There is no need to worry too much, the pacemaker’s anti-interference ability has improved a lot compared to the past, so if no abnormalities are found in the routine post-operative follow-up program control, there will be no problem in your environment – even if there is really interference with the pacemaker, it can be adjusted back. Transmitting towers for mobile communication have no effect. Cell phones are recommended to be kept at 30cm (i.e. answering with the other hand will not be a problem). All well grounded appliances will have no effect (but induction cookers are inconclusive and are not recommended).