These EM-4100 family products are designed to work with our RFID Card Reader and RFID Reader USB 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 in any quantity.
EM4100 Family Passive Tags
125 kHz activating frequency
Readable from 2 to 4 inches of RFID reader
Compatible with These Kits:
RFID Card Reader (Serial)
RFID Card Reader (USB)
RFID Read/Write Module (Serial)