Prevent information leakage】: I can effectively prevent mobile phone electromagnetic radiation, protect health, is the first choice of pregnant mothers and white-collar workers. Reduce Radiation】: Faraday box is very effective in eliminating the harmful effects of radio waves, WIFI signals or electromagnetic fields in our daily lives. carbon fibre prevents most WIFI, cell phone signals and radiation from passing through Anti-GPS tracking positioning】: shield wireless signals, prevent data theft, protect personal safety. Product size】: Faraday box size，4.5inx3.5inx2.3in,6.6inx4.8inx3.7in,7.4inx4.7inx3.5in,You can put all of your family‘s keys and spare keys in this car key storage faraday box to give your car a safety protection. A Faraday cage effectively blocks all signals inside it, preventing criminals from gaining access to your vehicle using a keyring card reader.