{"product_id":"usb-125khz-rfid-card-reader-em4100-plug-play-access-control","title":"USB 125KHz RFID Card Reader – Plug \u0026 Play EM4100 No Driver","description":"\n\u003ch2\u003eUSB 125KHz RFID Card Reader – Plug \u0026amp; Play, No Driver Required\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAsia-Teco R20D USB RFID Card Reader\u003c\/strong\u003e makes contactless card reading effortless. Operating at \u003cstrong\u003e125KHz\u003c\/strong\u003e and supporting EM4100 \/ TK4100 chip cards, this compact desktop reader connects via USB and is instantly recognized by your computer — no drivers, no software installation needed. Simply plug it in, open any text-based application (Notepad, Word, Excel, or your access control software), and swipe a compatible card to have the 10-digit card number entered automatically at your cursor, just like a keyboard input.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're setting up an \u003cstrong\u003eoffice access control system\u003c\/strong\u003e, managing employee attendance, or building a DIY security project, this reader delivers fast, reliable reads every time. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlug \u0026amp; Play:\u003c\/strong\u003e No driver installation required — works straight out of the box on Windows and Linux\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e125KHz Frequency:\u003c\/strong\u003e Compatible with EM4100 and TK4100 proximity cards and key fobs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUSB Powered:\u003c\/strong\u003e Operates at 5V via USB — no external power supply needed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10-Digit Output:\u003c\/strong\u003e Automatically outputs card serial number as keyboard input to any active text field\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED \u0026amp; Buzzer Feedback:\u003c\/strong\u003e Red LED standby indicator flashes green on successful read; buzzer confirms each swipe\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad OS Compatibility:\u003c\/strong\u003e Windows 98, XP, 2000, CE, 7, 8, 10, and Linux\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Desktop Design:\u003c\/strong\u003e Lightweight and space-saving for desk or counter placement\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\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAsia-Teco\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eR20D\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\u003eSupported Chips\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEM4100 \/ TK4100\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V (USB-powered)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Format\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10-digit (default)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIndicator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLED (Red standby \/ Green on read)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAudio Feedback\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuilt-in buzzer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible OS\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWindows 98\/XP\/2000\/CE\/7\/8\/10, 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\u003eHow It Works\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003ePlug the reader into any available USB port on your computer.\u003c\/li\u003e\n  \u003cli\u003eThe reader beeps and the LED turns red, indicating it is ready and waiting for a card.\u003c\/li\u003e\n  \u003cli\u003eOpen any text editor or input field (Notepad, Excel, your access control software, etc.).\u003c\/li\u003e\n  \u003cli\u003eHold a compatible 125KHz EM4100 or TK4100 card or key fob near the reader.\u003c\/li\u003e\n  \u003cli\u003eThe LED flashes green, the buzzer sounds, and the 10-digit card number is instantly typed at your cursor.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eIdeal Use Cases\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eOffice \u0026amp; building access control systems\u003c\/li\u003e\n  \u003cli\u003eEmployee attendance tracking\u003c\/li\u003e\n  \u003cli\u003eIT asset and inventory management\u003c\/li\u003e\n  \u003cli\u003eDIY home security and automation projects\u003c\/li\u003e\n  \u003cli\u003eLibrary card management systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor general guidance on RFID technology and security systems, visit the \u003ca href=\"https:\/\/www.nist.gov\/publications\/guidelines-securing-radio-frequency-identification-rfid-systems\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eNIST Guidelines for Securing RFID Systems\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Does this USB RFID card reader require any special drivers or software to install?\u003c\/h4\u003e\n\u003cp\u003eA: No — the Asia-Teco R20D is a completely driverless, plug-and-play device. Simply connect it to your computer's USB port and it is immediately recognized as a standard HID (Human Interface Device) keyboard. No additional software or drivers are needed on Windows or Linux.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What types of cards and key fobs are compatible with this 125KHz RFID reader?\u003c\/h4\u003e\n\u003cp\u003eA: This reader is compatible with any 125KHz proximity card or key fob that uses the EM4100 or TK4100 chip standard. These are among the most widely used RFID card formats for access control, attendance systems, and ID management. It does NOT support 13.56MHz cards (such as MIFARE or HID iCLASS).\u003c\/p\u003e\n\n\u003ch4\u003eQ: How does the card reader output the card data to my computer?\u003c\/h4\u003e\n\u003cp\u003eA: The reader functions as a virtual USB keyboard. When a compatible card is swiped, it automatically types the card's 10-digit serial number directly into whatever text field or application is active on your screen — just as if you had typed it manually. No middleware or SDK is required.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this RFID reader on Linux?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The Asia-Teco R20D supports Linux in addition to Windows 98, XP, 2000, CE, 7, 8, and 10. Because it uses the standard HID USB protocol, most modern operating systems will detect and use it automatically without any configuration.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this reader need an external power supply?\u003c\/h4\u003e\n\u003cp\u003eA: No. The reader is fully powered through the USB connection at 5V, so no external power adapter or battery is needed. Any standard USB port on a desktop, laptop, or USB hub will power it.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does this USB RFID card reader require any special drivers or software to install?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — the Asia-Teco R20D is a completely driverless, plug-and-play device. Simply connect it to your computer's USB port and it is immediately recognized as a standard HID (Human Interface Device) keyboard. No additional software or drivers are needed on Windows or Linux.\"}}, {\"@type\": \"Question\", \"name\": \"What types of cards and key fobs are compatible with this 125KHz RFID reader?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This reader is compatible with any 125KHz proximity card or key fob that uses the EM4100 or TK4100 chip standard. 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