CAL PDA Modules are compact RFID reader modules for PDA/Pocket PC with CF card interface. Callisto PDA Modules are easy to install as they can be simply plugged into the CF card slot of the PDA. Installation of our software is required on the PDA for it to RFID Tags. CAL PDA Modules have been successfully used for applications such as Data collection terminal, Access control terminal, Time and Attendance, Logistics systems and Guard tour terminal.