Block-It Pocket anti-spying, RF/EMF radiation protection Bag/Case/Pouch (green) Blocks remote NSA style spying, industrial espionage, location tracking. Blocks constant pings to cell phone towers. GPS signals. that can give constantly track your location. Blocks scanning and use of your phone's microphone, cameras, NFC, Bluethooth, and Wifi connections silver impregnated, creates Faraday cage to block signals. Made in the USA