Specification :

The TK4100 contactless smart chip cards SMC4100 IC based on a roller connected with a few laps, which are then embedded in plastic. No batteries required. This map is read-only, 40-bit unique number in the Manchester code.
TK4100 is compatible EM4100. These cards are primarily used in access control applications and other identity authentication.

# Protocol : 125KHz EM4100 Compatible
# EEPROM Size : 40 bit
# Material : PVC
# Temperature : -20¡ã - +50¡ã
# Dimension : 85.6 ¡� 54 ¡� 0.86 ( mm )