most of the current passport packbag,credit cad and id card with an rfid chip,the chip there are sensitive personal information.hankers can as far as 10 feet (about 3 meters) distance using reid reader to get that information. many mobile phone on the market with the nfc function, you can read the credit card details.our latest researsh and development of intelligent shielding technology can already be shielding the transmission of the most radio frequency, avoiding your personal date to fail into the hands of others.