# How RFID Blockers Work ## Understanding RFID Technology and Security Risks Radio Frequency Identification (RFID) technology has become ubiquitous in modern life, embedded in credit cards, passports, key fobs, and access cards. While convenient, this technology introduces security vulnerabilities, as scanners can potentially read these chips without physical contact or your knowledge. This is where **RFID blockers** come into play. ### My Personal Experience with Digital Pickpocketing Several years ago, I was traveling in a crowded European metro. Nothing was stolen from my pocket, but months later, I noticed small, unauthorized transactions on a credit card I had carried during that trip. My bank confirmed it was likely a case of "skimming" or digital pickpocketing. This personal encounter made me acutely aware of the silent threat posed by unprotected RFID chips. It wasn't about a lost wallet; it was about data being stolen while the card was securely in my possession. This experience drove me to deeply research RFID security, transforming a personal concern into a practical skill in evaluating digital security products. ### The Technical Mechanics of RFID Blocking An **RFID blocker**, typically a sleeve, wallet, or card, works on a simple yet effective principle: it creates a Faraday cage around your RFID-enabled items. This cage is made from materials that interfere with electromagnetic fields. 1. **Material Science:** Most blockers use a mesh of metallic fibers (like aluminum, nickel, or copper) woven into fabric or layered in a laminate. This conductive network absorbs and disperses radio waves. 2. **The Faraday Effect:** When an external RFID reader's signal (usually at 13.56 MHz for high-frequency cards) hits the blocker, the conductive material redistributes the electromagnetic charge. This prevents the signal from reaching the chip inside and, crucially, blocks the chip's weak return signal from being read. 3. **Shielding vs. Jamming:** It's vital to note that blockers *shield* passively; they do not actively jam or broadcast signals, which is often illegal. They simply create a passive barrier. ### TIANJUN Advanced RFID Blocking Card: Technical Specifications For those seeking robust protection, TIANJUN offers a premium RFID blocking card that fits seamlessly into any wallet. Here are its detailed technical specifications: * **Product