【Improve】Security Faraday Pouch inside has two layer layout, interior layer block sign, prevent your cell phone and keyless entry fobs from becoming remotely accessed; Outer layer can cut down radiation, provide enough protection for pregnant, ideal for pregnant Girls. The acronym FOB is belied to face for ‘frequency operated button’. https://mylespssww.madmouseblog.com/13329045/the-basic-principles-of-faraday-bag-phone