EMPShield[1] claims to make products that can protect against events such as lightning strikes and high-altitude nuclear explosions that generate EMPs. As an EE I find the design, theory, and testing[2] extremely questionable. It seems that this company has other skeptics[3]. It's infamous with mechanics who see them in cars, or are asked to install them.<p>They sell a small box that hooks up to your car battery, or your the mains in the breaker panel for your house. There's a few feet of cabling to a small box which they claim can clamp the energy from the EMP. If you try to search youtube for this product you can only find positive reviews from the "prepper" community, and any tear-downs seem to have been removed. The company claims to be active with the military as well.<p>Their testing consists of legitimate testing for EMP, however they only test the unit itself -- not hooked up to anything. I don't see any evidence that this product actually works when hooked up to a car or house. Am I going crazy here, is this a huge scam or some legitimate technology?<p>[1] <a href="https://www.empshield.com/" rel="nofollow noreferrer">https://www.empshield.com/</a>
[2] <a href="http://www.empshield.com/wp-content/uploads/2019/11/EMP_Shield_Military_Testing_16_March_2019_Public2.pdf" rel="nofollow noreferrer">http://www.empshield.com/wp-content/uploads/2019/11/EMP_Shie...</a>
[3] <a href="https://www.eevblog.com/forum/news/emp-shield-scam/" rel="nofollow noreferrer">https://www.eevblog.com/forum/news/emp-shield-scam/</a>