The Digital Matter RFID reader is a 125kHz EM4001 compatible reader.
This is a simple and relatively low cost solution for clients that do not already have access / identification cards or keyfobs.
If you need a specific type of card read then please discuss with Digital Matter.
The best way to go about this is to source a reader that can read the required cards and can output RS232.
The G100 has a RS232 interface that can be used to interface to 3rd party readers.
This process normally involves the partner / client sourcing the reader that they want or need to use and we integrate the reader protocol into the firmware on the G100.