{"product_id":"mini-usb-125khz-rfid-em-card-reader-android-otg-windows","title":"Mini USB 125KHz RFID Card Reader – Android OTG \u0026 Windows","description":"\n\u003ch2\u003eMini Portable 125KHz USB RFID Card Reader\u003c\/h2\u003e\n\u003cp\u003eCompact, plug-and-play, and incredibly versatile — this Mini USB RFID Card Reader makes reading 125KHz EM-format proximity cards effortless on both Android (OTG) smartphones and Windows PCs. Whether you're managing access control, attendance tracking, or ID card verification, this reader delivers fast, reliable reads in under 0.5 seconds — no extra software or drivers required on most systems.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal 125KHz Frequency:\u003c\/strong\u003e Compatible with TK4100, EM4100, and EM4001 card formats — the most widely used proximity card standard.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Compact Design:\u003c\/strong\u003e Measures just 35mm × 35mm × 7mm, making it easy to carry in a pocket or bag or leave permanently plugged in.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Read Speed:\u003c\/strong\u003e Reads card data in under 0.5 seconds with a sensing distance of 0–8 cm.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e Works seamlessly with Android devices via OTG (Samsung, Sony, Vivo, Xiaomi, and more) and Windows systems including Windows 8, 7, XP, Vista, 2000, ME, NT, CE, and Linux.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Powered:\u003c\/strong\u003e Draws only 100mA at +5V DC — powered directly from your USB or Micro-USB port, no external power supply needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRead-Only Operation with Fail-Safe Signaling:\u003c\/strong\u003e Secure, read-only mode with signal-based fail-safe feedback for reliable performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlug-and-Play:\u003c\/strong\u003e Recognized instantly by compatible systems — no complex setup required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eR65D\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRead Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRead Only\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSecurity Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFail Safe with Signal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReading Speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.5 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensing Distance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+5V DC via USB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Draw\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e35mm × 35mm × 7mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupported Cards\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTK4100 \/ EM4100 \/ EM4001\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible OS\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAndroid (OTG), Windows 8\/7\/XP\/Vista\/2000\/ME\/NT\/CE, Linux\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Mini USB RFID 125KHz EM Card Reader (Model R65D)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal Use Cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eOffice and building access control management\u003c\/li\u003e\n  \u003cli\u003eEmployee and student attendance tracking\u003c\/li\u003e\n  \u003cli\u003eID card verification and data collection\u003c\/li\u003e\n  \u003cli\u003eDevelopers and hobbyists building RFID-based projects\u003c\/li\u003e\n  \u003cli\u003eOn-the-go card reading with Android OTG smartphones or tablets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor further information on RFID technology standards and security, visit the NIST Guidelines for Securing RFID Systems.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What types of RFID cards are compatible with this 125KHz USB card reader?\u003c\/h4\u003e\n\u003cp\u003eA: This reader supports TK4100, EM4100, and EM4001 format cards — the most common 125KHz proximity card types used in access control, attendance systems, and ID badge applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this RFID card reader work with Android smartphones?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! As long as your Android smartphone or tablet supports USB OTG (On-The-Go), this reader connects via Micro-USB and works with popular brands including Samsung, Sony, Vivo, Xiaomi, and many more.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do I need to install any drivers or software to use this card reader?\u003c\/h4\u003e\n\u003cp\u003eA: In most cases, no additional drivers are needed. The device is designed to be plug-and-play on Windows (XP, 7, 8, Vista, and more) and compatible Android OTG devices. It emulates a keyboard input, sending card data directly to any active text field or application.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the maximum reading distance of this RFID reader?\u003c\/h4\u003e\n\u003cp\u003eA: The sensing distance is 0 to 8 cm, depending on the card type and environmental conditions. For best results, hold the card within a few centimeters of the reader face.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What types of RFID cards are compatible with this 125KHz USB card reader?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This reader supports TK4100, EM4100, and EM4001 format cards — the most common 125KHz proximity card types used in access control, attendance systems, and ID badge applications.\"}}, {\"@type\": \"Question\", \"name\": \"Does this RFID card reader work with Android smartphones?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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