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A conductive enclosure used to block electrostatic fields is also known as a Faraday cage. The amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of holes in a shield to an incident electromagnetic field.
There are RFID-blocking wallets, purses, sleeves, and cards. Wallets, purses, and sleeves work by acting as a Faraday cage that creates a screen around contactless cards, which stops electromagnetic fields interacting with the cards.
Screen protectors have been known to interfere with the operation of some touchscreens. [4] Also, an existing oleophobic coating of a touchscreen will be covered, although some tempered glass screen protectors come with their own oleophobic coating. On some devices, the thickness of screen protectors can affect the look and feel of the device.
A related contactless technology is RFID (radio frequency identification). In certain cases, it can be used for applications similar to those of contactless smart cards, such as for electronic toll collection. RFID devices usually do not include writeable memory or microcontroller processing capability as contactless smart cards often do.
An early work exploring RFID is the landmark 1948 paper by Harry Stockman, [9] who predicted that "Considerable research and development work has to be done before the remaining basic problems in reflected-power communication are solved, and before the field of useful applications is explored."
This can work even retrospectively — given that a stolen credit card can easily be invalidated with a phone call to the issuing bank, the motivation to steal one is reduced. In the case of vehicle theft, the best deterrent to theft is in the installation of an approved vehicle anti-theft passive immobilizer .