RFID TAG 125kHz EM, ø50 mm x 2.5 mm with center hole, black.

125kHz RFID TAG with screw hole
50 mm diameter x 2.5 mm
Suitable for guard rounding as a checkpoint
ASK 64 bits,
Manchester encoding; 10 digits in HEX
With RFID, the code reads Decimal: 12 digits