This RFID tag comes in a key chain package, which is commonly used in Access Control, Presence Sensing etc. This RFID tag operates in 125KHz RF range and have a 32 bit unique ID which is not re-programmable. Works with EM-18 RFID Reader Module. EM4100 Family Passive RFID Tag.

The EM-18 RFID Reader module operating at 125kHz is an inexpensive solution for your RFID based application. The Reader module comes with an on-chip antenna and can be powered up with a 5V power supply. Power-up the module and connect the transmit pin of the module to receive pin of your microcontroller. Show your card within the reading distance and the card number is thrown at the output. Optionally the module can be configured for also a weigand output.

Features:
   • Reading Distance: 6-10 cm
   • Frequency: 125kHz
   • Current Rating: 35mA (Max)
   • Operating Voltage: 4.6V - 5.4VDC