125KHz digitally encrypted Proximity Card Readers provide the highest level of security, making it virtually impossible to create unauthorized duplicates or fake IDs.   RFTiny -125KHz Proximity Card Reader   RF10 - 125KHz Proximity Card Reader (Mullion)        RF20 -125KHz Proximity Card Reader (Wall Mount)   RF30 - 125KHz Mid Range Proximity Card Reader     RFK101 - 125KHz Pin & Proximity Card Reader   RFK 505 -125KHz Pin & Proximity Card Reader