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Faraday key wallet - signal blocker for car keys  Features:  The case works on the principle of a Faraday cage: like a shield, it blocks electromagnetic waves. It does not send any signals itself and does 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.). This car key wallet provides full protection and safety of your vehicle. Secures the car against theft. It also protects ID cards from information leakage. Faraday bag also works also as anti-degaussing: all kinds of memory cards and electronic products with storage media are placed in the shielding bag to prevent degaussing, protect the data information stored therein, and avoid the interference of electromagnetic fields and prevent data loss. If the bank card is placed in the shielding bag, the signal of the mobile phone can be prevented from degaussing the bank card. This key wallet has 2 key carabiners, one internal and one external, with a clip for the RFID key. Velcro fastening. Made of durable materials.  Specifications:  Dimensions: 131x94mm. Weight: 35g. Colour: black. Signal blocking: RFID, Bluetooth, 4G connection, Wifi, GPS, GSM, etc.