125 kHz is the simplest type of RFID. While limited, it is somewhat more reliable, with better range (up to 10 cm or more, depending on the reader).
RFID chips in the 125 kHz range are always read‑only. This means that – for better or worse – data can’t be written to them. Instead, each tag has a unique 64‑ or 128‑bit serial number. These IDs can be used as a form of unique barcodes. Some cards/fobs also have unique numbers printed on them.
125 kHz RFID is mainly used in systems without high security requirements: for opening doors, lifts/elevators, gates; in library cards; for clocking in/out at work, animal identification, etc. Common chips for 125 kHz RFID include EM4100 and EM4200 (which is backward‑compatible with the 4100).
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