Mini USB 125KHz RFID Card Reader – Android OTG & Windows

Mini Portable 125KHz USB RFID Card Reader

Compact, 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.

Key Features

• Universal 125KHz Frequency: Compatible with TK4100, EM4100, and EM4001 card formats — the most widely used proximity card standard.
• Ultra-Compact Design: Measures just 35mm × 35mm × 7mm, making it easy to carry in a pocket or bag or leave permanently plugged in.
• Fast Read Speed: Reads card data in under 0.5 seconds with a sensing distance of 0–8 cm.
• Broad Compatibility: 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.
• USB Powered: Draws only 100mA at +5V DC — powered directly from your USB or Micro-USB port, no external power supply needed.
• Read-Only Operation with Fail-Safe Signaling: Secure, read-only mode with signal-based fail-safe feedback for reliable performance.
• Plug-and-Play: Recognized instantly by compatible systems — no complex setup required.

Technical Specifications

What's in the Box?

• 1 × Mini USB RFID 125KHz EM Card Reader (Model R65D)

Ideal Use Cases

• Office and building access control management
• Employee and student attendance tracking
• ID card verification and data collection
• Developers and hobbyists building RFID-based projects
• On-the-go card reading with Android OTG smartphones or tablets

For further information on RFID technology standards and security, visit the NIST Guidelines for Securing RFID Systems.

Frequently Asked Questions

Q: What types of RFID cards are compatible with this 125KHz USB card reader?

A: 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.

Q: Does this RFID card reader work with Android smartphones?

A: 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.

Q: Do I need to install any drivers or software to use this card reader?

A: 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.

Q: What is the maximum reading distance of this RFID reader?

A: 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.