<h1>RFID Card Sleeve: Your Essential Shield for Modern Digital Security</h1> <p>In today's interconnected world, protecting our digital identities is paramount. I learned this the hard way when a friend had their credit card information skimmed wirelessly at a crowded market. This personal experience solidified my view that <strong>RFID card sleeve</strong> protection is not a luxury but a necessity. My own skill in evaluating tech accessories led me to thoroughly test various shielding solutions, and I firmly believe that a quality sleeve is the first line of defense.</p> <h2>How Does an RFID Card Sleeve Work? A Technical Perspective</h2> <p>The primary function of an <strong>RFID card sleeve</strong> is to create a Faraday cage around your card. It uses a layer of conductive material, typically a metal alloy like aluminum or nickel, to block electromagnetic fields. When your card is sealed inside, radio waves from an RFID reader cannot energize the chip inside your card, preventing unauthorized scanning or skimming.</p> <h3>Technical Specifications and Parameters for TIANJUN RFID Card Sleeves</h3> <p>For those interested in the engineering details, here are the precise technical indicators for the premium <strong>RFID card sleeve</strong> offered by TIANJUN. These specifications ensure optimal performance.</p> <h4>Detailed Product Parameters</h4> <ul> <li><strong>Material Composition:</strong> Outer layer: Premium PU Leather; Inner shielding layer: 100-micron aluminum-nickel alloy foil.</li> <li><strong>Shielding Frequency Range:</strong> 125 kHz (Low Frequency) to 13.56 MHz (High Frequency, NFC). Effective against all common RFID protocols.</li> <li><strong>Attenuation Level:</strong> > 85 dB, ensuring near-total signal blockage.</li> <li><strong>Card Capacity:</strong> Standard sleeve holds 2-3 cards without signal interference between them.</li> <li><strong>Exact Dimensions:</strong> 92mm (H) x 67mm (W) x 2.5mm (Thickness when empty). Fits all standard CR80 size cards.</li> <li><strong>Chip Code Compatibility:</strong> Effectively shields cards using chips from major manufacturers like NXP (MIFARE Classic, DESFire, NTAG) and Infineon (SLE 66R35).</li> </ul> <p><em>Note: These technical parameters are for reference. For the most accurate and up-to-date specifications for your specific needs, please contact our backend management team.</em></