03dec11 protect yourself by purchasing these super ectronic enclosures....introduce a vacuum in them and build a wall, then another wall... until finished..you are protected from rf signals, infrasound, ultrasound, electromagnetism, emp and certain types of lasers(plasma)...etc....the use of ultrasound and infrasound in outter space is prohibited by the laws of physics...see: http://www.polycase.com/dc-96f?file=2d