USB 125KHz RFID Card Reader – Plug & Play EM4100 No Driver

USB 125KHz RFID Card Reader – Plug & Play, No Driver Required

The Asia-Teco R20D USB RFID Card Reader makes contactless card reading effortless. Operating at 125KHz 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.

Whether you're setting up an office access control system, managing employee attendance, or building a DIY security project, this reader delivers fast, reliable reads every time. Made in Mainland China.

Key Features

• Plug & Play: No driver installation required — works straight out of the box on Windows and Linux
• 125KHz Frequency: Compatible with EM4100 and TK4100 proximity cards and key fobs
• USB Powered: Operates at 5V via USB — no external power supply needed
• 10-Digit Output: Automatically outputs card serial number as keyboard input to any active text field
• LED & Buzzer Feedback: Red LED standby indicator flashes green on successful read; buzzer confirms each swipe
• Broad OS Compatibility: Windows 98, XP, 2000, CE, 7, 8, 10, and Linux
• Compact Desktop Design: Lightweight and space-saving for desk or counter placement

Technical Specifications

How It Works

1. Plug the reader into any available USB port on your computer.
2. The reader beeps and the LED turns red, indicating it is ready and waiting for a card.
3. Open any text editor or input field (Notepad, Excel, your access control software, etc.).
4. Hold a compatible 125KHz EM4100 or TK4100 card or key fob near the reader.
5. The LED flashes green, the buzzer sounds, and the 10-digit card number is instantly typed at your cursor.

Ideal Use Cases

• Office & building access control systems
• Employee attendance tracking
• IT asset and inventory management
• DIY home security and automation projects
• Library card management systems

For general guidance on RFID technology and security systems, visit the NIST Guidelines for Securing RFID Systems.

Frequently Asked Questions

Q: Does this USB RFID card reader require any special drivers or software to install?

A: 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.

Q: What types of cards and key fobs are compatible with this 125KHz RFID reader?

A: 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).

Q: How does the card reader output the card data to my computer?

A: 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.

Q: Can I use this RFID reader on Linux?

A: 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.

Q: Does this reader need an external power supply?

A: 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.