125Khz RFID Long Distance Reader Module, 40CM, UART [Kit]


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  • Reading distance is far
  • Strong decoding capability
  • Low power consumption
  • Industrial grade, long continuous card reader performance is stable and reliable.
  • Support serial uart interface, or standard access control standard – 26 bit Wiegand


  • Built-in CPU decoding, direct serial port 9600 baud TTL level output card number, can also choose Wiegan 26 output card number, the use of very simple
  • Comes with buzzer, indicator output pin. Direct read when power up.
  • Module size 16 * 24MM, the volume is very small, the antenna can be any match (to support their own winding)
  • The module uses a common 2.54mm pitch pin, can be easily embedded in various systems.
  • Wide voltage supply 3.5V to 6V, current about 25mA
  • Well tested, mature product
  • Test the EM standard thick card
    • Support EM4100, 4001, TK4100, EM4305, etc. 125K RF card card serial number. But must be good cards!
    • Diameter 45mm coil antenna can reach 25CM reader distance!
    • Use the 97mm coil antenna (retangular) to reach 40CM!
    • Support read through door/wall, etc
    • Card and key tag are available in store.


  • Notice demo video shows the BEST ideal setup, different setup can not get the same good result. Read more details in our wiki instructions.
  • Please ONLY use with high quality cards, if you use other cards, it may not work as expected distance.

EL125 Main Reader Package includes:

  • Main PCB Module Board
  • A power filter capacitor
  • 97mm Retangular Antenna
  • A test-proof card, which can make sure reach 40cm. 

Other Accessories available in this link:

  • 2PCs EL125 high quality test-proof cards – tested up to 41CM
  • 2PCs High quality 3.5mm diameter coin key cards – tested up to 24CM

All documentation, demo videos, guides please see on this page portal. 

Additional information

Weight N/A

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16 reviews for 125Khz RFID Long Distance Reader Module, 40CM, UART [Kit]

  1. 1 out of 5

    zarax (verified owner)

    No documentation at all, unable to use it….

  2. 4 out of 5

    gkalemis (verified owner)

    Good solid product. You have to read the wiki page for the connections and use github code in the beginning. Support from the store is excellent. I achieved around 30cm with the included fat card. Buzzer is not included.

  3. 5 out of 5

    bjornhallberg (verified owner)

    Good range compared to other modules. Does require good quality power supply to reach its advertised 40cm though (the video in the description was run on 3xAA/AAA type batteries!) but even on a “normal” supply you will get ~20cm. I don’t know the exact range I get out of the cheap rdm6300 modules under comparable circumstances with the same card but it might be as short as ~2cm. So thumbs up for this module. Was also able to run it on 3.3V … range seems to be the same as on 5V (at least with a crap power supply).

  4. 1 out of 5

    Satyam Raj (verified owner)

    The documentation page is not working

  5. 3 out of 5

    Chao (store manager)

    It is working, please login first, you can find the login credential in your order tracking info email.

  6. 5 out of 5

    Satyam Raj (verified owner)

    Sorry for the bad review earlier. forgot to login. Its working now. Thanks:)

  7. FinitePi (verified owner)

    Excellent Board. Reading range is exactly as mentioned in the title. Reading range reduce when the antenna in the RFID tag becomes smaller and smaller. This is obvious. The white card has bigger antenna and hence works at distance of 30cms. If you use keyfob the reading distance reduces to half. This has nothing to do with this item. A good value for money. Customer support is good.

  8. 5 out of 5

    FinitePi (verified owner)

    Forgot to rate. It is 5 star

  9. 3 out of 5

    Martin Kinold (verified owner)

    I’m not able to log in into wiki page….create new user account failed any time and I cannot find the order tracking email from…..2018 😀

  10. Jacob Lee (verified owner)

    Using the Wiegand interface to a mega 2560 board, I achieved 100mm +-5mm with the card, and around 45mm with a small tag. Works for the application i needed, and good sized antenna.

  11. 5 out of 5

    Saul (verified owner)

    Works well, I certainly get a reliable 20 cm read range with the card and slightly less with smaller tags. Wiring diagram and specification provided in the order tracking email, and when I lost it they replied to give me access to the password protected wiki page.

  12. Gani

    Hi, thinking of buying this item.
    Do you have a working code for this product so I can use it easily?
    Thanks 🙂

  13. 1 out of 5

    Ed B.

    Jacob Lee,

    I am trying to use a Mega 2560 board, but have been unsuccessful. I see you seem to have been successful. I am getting good read range if the LED is to be believed, but unable to get Serial information from card or tags.

    Can you tell me how to do this?


  14. Chao (store manager)

    Dear Ed,

    You must read the wiki page instruction for the usage: https://www.electrodragon.com/w/EL125_HDK

    For serial port output, you must select pin 3 to high, otherwise could be no output.

    Best regards,

  15. Alparslan

    good luck, can this product be used with arduino?

  16. 5 out of 5

    Balázs Horváth (verified owner)

    It was worked well with arduino, but now it shows “FFFFFF” (in HEX) sometime during the reading. What could be the problem?

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