Multitop is a new desktop reader family for 125 kHz or 13.56 MHz transponders, offering HID functionality or virtual COM-port mode. 

This HID function has the advantage that no special drivers need to be installed. Simply connect the Multitop reader to a standard USB interface to use this reader as keyboard emulation.

In virtual COM, drivers are available for different OS, such as several Windows versions ( 32 and 64 bits ),  Mac OS 8/9, OS-X and Linux 2.4 and higher.