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2. Faraday cage - Wikipedia

   en.wikipedia.org/wiki/Faraday_cage

   Similar containers are used to resist RFID skimming. Elevators and other rooms with metallic conducting frames and walls simulate a Faraday cage effect, leading to a loss of signal and "dead zones" for users of cellular phones, radios, and other electronic devices that require external electromagnetic signals. During training, firefighters and ...

3. RFID skimming - Wikipedia

   en.wikipedia.org/wiki/RFID_skimming

   An RFID blocking card is an RFID-blocking device that operates without a battery by receiving the RFID signal from a card reader or skimmer and it scrambles the RFID ...

4. Electromagnetic shielding - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_shielding

   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.

5. Radio-frequency identification - Wikipedia

   en.wikipedia.org/wiki/Radio-frequency_identification

   Radio-frequency identification (RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder called a tag, a radio receiver, and a transmitter.

6. Radio jamming - Wikipedia

   en.wikipedia.org/wiki/Radio_jamming

   Radio jamming is the deliberate blocking of or interference with wireless communications. [1] [2] In some cases, jammers work by the transmission of radio signals that disrupt telecommunications by decreasing the signal-to-noise ratio. [3] The concept can be used in wireless data networks to disrupt information flow. [4]

7. How to Block Annoying Emails for Good - AOL

   www.aol.com/block-annoying-emails-good-190739065...

   Click “Junk” > “Block Sender” How to block emails on Yahoo. Web browser. Open an email from the sender that you want to block. Click the three-dot icon at the top of the email. Click ...