EM4100 RFID Blue Eye Key Fob Tag - Unique ID

$2.95 ea

  • RoHS Compliant
# of units Price
1+ $2.95
5+ $2.75
25+ $2.49
100+ $2.25

RFID Blue Eye Key Fob Tag

These EM-4100 family products are designed to work with our Serial RFID Card Reader (#28140) and the USB RFID Reader (#28340) and are considered passive tags. Each tag has a unique 10 digit ID, so multiple tags can be used in a single project and may be purchased from Parallax in any quantity.

Note: In accordance with U.S. Patent Nos. RE40,145; 5,817,207; 6,036,099; 6,214,155; 6,514,367; and 6,557,766.


  • EM4100 Family Passive Tags
  • 125 kHz activating frequency
  • Unique ID
  • Readable from 2 to 5 inches of RFID reader
  • Keychain tag for attachment

    Compatible with These Kits

  • RFID Card Reader (Serial)
  • RFID Card Reader (USB)
  • RFID Read/Write Module (Serial)

    Downloads & Resources

  • RFID BS1 Source Code
  • RFID BS2 Example Code
  • RFID Card Reader Documentation

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