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Faraday card sleeve - signal blocker for ID cards  Features:  The card sleeve works on the principle of a Faraday cage: like a shield, it blocks electromagnetic waves. They do not send any signals themselves and do not affect other electrical devices outside. Thanks to Michael Faraday's discovery, many devices in our daily lives protect us from the harmful effects of waves or electrical discharges (such as cables, microwave ovens, cars, airplanes etc.). These card sleeves are designed for ID cards to protect the information they contain from being read and from data degaussing from interference of electromagnetic fields. If the bank card is placed in this shielding sleeve, the signal of the mobile phone can be prevented from degaussing the bank card, thereby avoiding the trouble of eliminating the tape.  Specifications:  Dimensions: 88x57mm Weight: 3g x2.  Signal blocking: RFID, Bluetooth, 4G connection, Wifi, GPS, GSM, etc.