125 kHz RFID

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Flipper Zero supports low-frequency (LF) radio frequency identification (RFID) technology that is implemented in access control systems, animal chips, and supply chain tracking systems. Unlike NFC cards, LF RFID cards usually do not provide high levels of security. This technology comes in many form-factors, such as plastic cards, key fobs, tags, wristbands, and animal microchips. Flipper Zero has a low-frequency RFID module capable of reading, saving, emulating, and writing LF RFID cards.
<div class="warning flipper-callout">
    <div class="callout-header">Insert a microSD card to use the 125 kHz RFID app</div>
    Before using the 125 kHz RFID app, make sure to update your Flipper Zero firmware with a microSD card inserted since Flipper Zero stores databases on a microSD card. For more information about the update process, visit the <a href="https://docs.flipperzero.one/basics/firmware-update" onclick="next.router.push('https://docs.flipperzero.one/basics/firmware-update')"><u>Firmware update</u> page.  
</div>
<div class="warning flipper-callout">
    <div class="callout-header">Insert a microSD card to use the 125 kHz RFID app</div>
    Before using the 125 kHz RFID app, make sure to update your Flipper Zero firmware with a microSD card inserted since Flipper Zero stores databases on a microSD card. For more information about the update process, visit the <a href="https://docs.flipperzero.one/basics/firmware-update" onclick="next.router.push('https://docs.flipperzero.one/basics/firmware-update')"><u>Firmware update</u> page.  
</div>
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On this page, you’ll find an overview of the 125 kHz RFID application, and learn more about the hardware behind the 125 kHz RFID module.
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125 kHz RFID menu
You can access the 125 kHz RFID application from the Main Menu. In the application, you can read, save, emulate, write, and generate new LF RFID cards.
125 kHz RFID application menu
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﻿Read: reads and saves LF RFID cards.
Saved: lists saved cards that can be emulated and written to a rewritable card.
﻿Add Manually: generates new virtual LF RFID cards by entering the cards’ ID.  
Extra Actions: allows to read LF RFID cards with the preselected ASK or PSK coding.
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125 kHz RFID hardware
Flipper Zero has a built-in RFID support with a low-frequency antenna located at the back of Flipper Zero. The STM32WB55 microcontroller unit is used for the 125 kHz RFID functionality.
125 kHz RFID hardware
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The low-frequency 125 kHz antenna is placed on the Dual Band RFID antenna next to the high-frequency 13.56 MHz antenna.
Dual Band RFID antenna
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Want to learn more? Check out these pages:
﻿Reading 125 kHz RFID cards﻿
﻿Adding 125 kHz cards manually﻿
﻿Writing data to T5577 cards﻿
﻿Animal microchips﻿
﻿Flipper Zero schematics﻿
﻿125 kHz RFID application source code﻿
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Updated 24 Oct 2024
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Frequencies
Reading 125 kHz RFID cards