Extremely Low Frequency Jammer

Someone who isn’t me is looking for a jammer that jams the 3hz to 30hz range that they can carry on their person which will run on a 9-volt battery or rechargeable battery. Please use the reply form below if you know where they can purchase one or if you can build them one. Thank you so much. Comments do not appear online unless approved. Comments will not appear online for this weblog and will be deleted once reviewed.