CDVI BTAG copy_by_marking the same key fob can

the same key fob can control access to different parts of a building:

These fobs communicate with compatible readers using 125 kHz low‑frequency RFID technology to grant entry to authorized users

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CDVI BTAG copy_by_marking the same key fob canCDVI BTAG key fobs are low frequency (125 kHz) tags based on EM4100 technology. The key fobs do not have the full serial number printed on them, therefore, CDVI BTAG key fobs cannot be copied by serial number. We support the following duplication methods for CDVI BTags: Buy a Proximity reader and clone it yourself. Mail in your fob to either our US fulfillment center or Canadian fulfillment center (You can email us for detailed instructions). , HID